CN114878116A - Pipeline low-temperature vibration test system and method - Google Patents
Pipeline low-temperature vibration test system and method Download PDFInfo
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- CN114878116A CN114878116A CN202210342422.1A CN202210342422A CN114878116A CN 114878116 A CN114878116 A CN 114878116A CN 202210342422 A CN202210342422 A CN 202210342422A CN 114878116 A CN114878116 A CN 114878116A
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
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Abstract
The invention provides a pipeline low-temperature vibration test system which comprises a multifunctional control console, a low-temperature liquid storage tank, a first switch valve, a first low-temperature liquid filling pipe, a pressure gauge, a second switch valve, an exhaust pipe, an air tightness inspection pipe, a pipeline fixing platform, an automatic balance auxiliary supporting device, a first connecting tool, a second connecting tool, a low-temperature protection plate, a vibration table, a second filling pipe, a fourth switch valve, an air pillow pipe, a pressure relief pipe, a third switch valve and a temperature sensor, wherein the low-temperature protection plate is arranged on the lower portion of the pipeline fixing platform; the multifunctional console comprises a nitrogen supply system; the low-temperature protection plate is arranged on the upper end surface of a movable part of the automatic balance auxiliary supporting device; the lower end face of a movable part of the automatic balance auxiliary supporting device is connected with the vibrating table; the invention provides an environment with deep low temperature and high internal pressure for a pipeline test piece and provides a real simulation environment for a pipeline low temperature vibration test of aerospace products by the integral pipeline arrangement and the matching of an external low temperature liquid nitrogen filling device.
Description
Technical Field
The invention relates to the technical field of vibration tests, in particular to a pipeline low-temperature vibration test system and method, and particularly relates to a system and method applied to a space navigation product pipeline low-temperature vibration test.
Background
In order to comprehensively improve the overall level and the capacity of aerospace products in China, meet the requirement of future aerospace development and keep the national status of aerospace technology in the world aerospace field, China develops the research and development work of a new generation of aerospace products. Different from the traditional aerospace products adopting the solid or solid-liquid mixed engine technology, the new generation aerospace products adopt the advanced low-temperature liquid engine, how to ensure that the heart of the low-temperature liquid engine normally works in the rocket flying process is undoubted, and the core problem in rocket development is undoubted. The pipeline system is used as a vital 'main artery' connecting the engine and the fuel tank, and the pipeline system needs to bear severe mechanical environments such as deep low temperature, high frequency vibration, high pressure and the like in the flying process, and whether the pipeline system can smoothly transport fuel to the engine is a prerequisite condition for ensuring the normal work of the engine, even one of key factors for determining the success or failure of rocket flying.
In order to ensure the reliability of aerospace products in the flight process, real dynamic environment simulation of deep low temperature and high internal pressure of a pipeline system needs to be carried out on the ground, and how to construct environments of deep low temperature and high internal pressure and the like is a great problem in test implementation.
Patent document CN211729606U discloses a vibration table, which comprises a base; an upper platform supported on the base; at least a set of vibrating motor group, install in the upper mounting plate orientation one side of base, each vibrating motor group includes two vibrating motor, two vibrating motor are followed the central line symmetry that the upper mounting plate is on a parallel with first direction sets up, just two vibrating motor's rotation direction is opposite. However, the scheme has no real dynamic environment simulation of deep low temperature and high internal pressure.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a pipeline low-temperature vibration test system and a pipeline low-temperature vibration test method.
The invention provides a pipeline low-temperature vibration test system which comprises a multifunctional control console, a low-temperature liquid storage tank, a first switch valve, a first low-temperature liquid filling pipe, a pressure gauge, a second switch valve, an exhaust pipe, an air tightness inspection pipe, a pipeline fixing platform, an automatic balance auxiliary supporting device, a first connecting tool, a second connecting tool, a low-temperature protection plate, a vibration table, a second filling pipe, a fourth switch valve, an air pillow pipe, a pressure relief pipe, a third switch valve and a temperature sensor, wherein the low-temperature protection plate is arranged on the lower portion of the pipeline fixing platform; the multifunctional console comprises a nitrogen supply system;
the first connecting tool and the second connecting tool are used for fixing a pipeline test piece, and the first connecting tool and the second connecting tool are both communicated with the pipeline test piece; the upper end of a pipeline test piece is fixed on a pipeline fixing platform through a first connecting tool, a temperature sensor is arranged on the contact surface of the upper end of the pipeline test piece and the first connecting tool, the first connecting tool is not communicated with the pipeline fixing platform, the bottom of the pipeline test piece is connected with the low-temperature protection plate through a second connecting tool, the second connecting tool is not communicated with the low-temperature protection plate, and the low-temperature protection plate is installed on the upper end surface of a movable part of the automatic balance auxiliary supporting device; the lower end face of a movable part of the automatic balance auxiliary supporting device is connected with the vibrating table;
the multifunctional console is connected with the low-temperature liquid storage tank through an air tightness inspection pipe, an exhaust pipe is arranged on the low-temperature liquid storage tank, and a second switch valve is arranged on the exhaust pipe; a first low-temperature liquid filling pipe and an air pillow pipe are respectively arranged at the bottom and the top of the low-temperature liquid storage tank, and the first low-temperature liquid filling pipe and the air pillow pipe are both communicated with the first connecting tool; a first switch valve is arranged on the first low-temperature liquid filling pipe; the air pillow pipe is provided with a pressure gauge and a pressure relief pipe, and the pressure relief pipe is provided with a third switch valve;
the second filling pipe is communicated with a second connecting tool, and a fourth switch valve is arranged on the second filling pipe; the second filling pipe is used for connecting an external low-temperature liquid nitrogen filling device;
the position of the low-temperature liquid storage tank is higher than the upper end of the pipeline test piece.
Preferably, a safety valve is arranged on the low-temperature liquid storage tank.
Preferably, the control system further comprises a first control line, a second control line and a second control line;
the multifunctional console further comprises a control system, the first switch valve, the second switch valve and the third switch valve are all electromagnetic valves, and the first switch valve, the second switch valve and the third switch valve are respectively electrically connected with the control system of the multifunctional console through a first control line, a second control line and a second control line.
Preferably, the low-temperature protection plate is made of glass fiber reinforced plastic materials.
Preferably, the fourth switching valve is a mechanical valve.
According to the low-temperature vibration test method for the pipeline, which is provided by the invention, the low-temperature vibration test system for the pipeline is adopted, and the method further comprises the following steps:
step 1: carrying out an airtight test on the pipeline low-temperature vibration test system;
step 2: performing gas replacement on the pipeline low-temperature vibration test system;
and 3, step 3: filling the pipeline test piece and the low-temperature liquid storage tank with low-temperature liquid;
and 4, step 4: the temperature of the pipeline test piece is ensured to be between 196 ℃ below zero and 185 ℃ below zero.
And 5: pressurizing the pipeline test piece, and recovering the initial length of the pipeline test piece by using the automatic balance auxiliary supporting device;
step 6: and maintaining the pressure of the pipeline test piece.
And 7: and starting a vibration table to apply vibration excitation to the pipeline test piece, and recording vibration test data through a measuring instrument.
And 8: and carrying out pressure relief and evacuation on the pipeline low-temperature vibration test system.
Preferably, the step 1 comprises:
and closing the fourth switch valve, the second switch valve and the third switch valve, opening the first switch valve, adding nitrogen into the low-temperature liquid storage tank and the pipeline test piece through the air tightness inspection pipe by using a multifunctional console, pressurizing to 0.2MPa, keeping the air pressure for 15min, if the pressure drop is less than 0.01MPa within 15min, indicating that the air tightness of the whole test system is good, and finally opening the third switch valve and unloading the pressure of the test system.
Preferably, the step 2 includes:
and opening the fourth switch valve, the second switch valve and the first switch valve, and filling nitrogen into the pipeline system by using the multifunctional console to remove water vapor in the pipeline for more than 10 min.
Preferably, the step 3 comprises:
and opening a fourth switch valve, a second switch valve and the first switch valve, closing the third switch valve, connecting a low-temperature liquid nitrogen filling device with the second filling pipe, fully pre-cooling the pipeline by using the low-temperature liquid nitrogen filling device, filling low-temperature liquid nitrogen into the pipeline test piece through the second filling pipe by using the low-temperature liquid nitrogen filling device along with the liquid nitrogen filling, filling the low-temperature liquid nitrogen into the low-temperature liquid storage tank through the first low-temperature liquid filling pipe, when discharging the liquid nitrogen from the exhaust pipe, indicating that the test pipeline and the low-temperature liquid storage tank are filled with the liquid nitrogen, and closing the fourth switch valve and the second switch valve to stop filling the liquid nitrogen.
Preferably, the step 5 comprises:
closing the second switch valve, and pressurizing the pipeline system by means of volatilization of liquid nitrogen in the low-temperature liquid storage tank and the pipeline test piece; in the pressurization process of the pipeline system, the height of the air bag of the automatic balance auxiliary supporting device is adjusted to adjust the position of the lower end of the pipeline test piece, so that the pipeline test piece returns to the initial length.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an environment with deep low temperature and high internal pressure for a pipeline test piece and provides a real simulation environment for a pipeline low temperature vibration test of aerospace products by the integral pipeline arrangement and the matching of an external low temperature liquid nitrogen filling device.
2. The invention effectively prevents the low-temperature fluid from damaging the vibrating table through the design of low-temperature protection plates and the like.
3. The multifunctional control console controls the opening or closing of the electromagnetic valve, accurately controls the pressure of the pipeline system, and provides reliable guarantee for testing space products and satisfactorily completing flight tasks of the space products.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of the present invention.
The figures show that:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a pipeline low-temperature vibration test system which comprises a multifunctional control console 1, a low-temperature liquid storage tank 2, a first switch valve 3, a first low-temperature liquid filling pipe 5, a pressure gauge 6, a second switch valve 7, an exhaust pipe 10, an air tightness inspection pipe 11, a pipeline fixing platform 12, an automatic balance auxiliary supporting device 13, a first connecting tool 151, a second connecting tool 152, a low-temperature protection plate 16, a vibration table 17, a second filling pipe 18, a fourth switch valve 19, an air pillow pipe 20, a pressure relief pipe 21, a third switch valve 22 and a temperature sensor 24, wherein the multifunctional control console is connected with the first switch valve and the second switch valve respectively; the multi-function console 1 includes a nitrogen gas supply system.
The first connecting tool 151 and the second connecting tool 152 are used for fixing the pipeline test piece 14, and the first connecting tool 151 and the second connecting tool 152 are both communicated with the pipeline test piece 14; the upper end of the pipeline test piece 14 is fixed on the pipeline fixing platform 12 through a first connecting tool 151, a temperature sensor 24 is arranged on the contact surface of the upper end of the pipeline test piece 14 and the first connecting tool 151, and the first connecting tool 151 is not communicated with the pipeline fixing platform 12; the bottom of the pipeline test piece 14 is connected with the low-temperature protection plate 16 through the second connecting tool 152, and the second connecting tool 152 is not communicated with the low-temperature protection plate 16. The low-temperature protection plate 16 is arranged on the upper end surface of a movable part of the automatic balance auxiliary supporting device 13; the lower end face of the movable part of the automatic balance auxiliary supporting device 13 is connected with the vibration table 17, specifically, the lower end face of the movable part of the automatic balance auxiliary supporting device 13 is connected with a moving coil of the vibration table 17, and the moving coil of the vibration table can transmit vibration excitation to the pipeline test piece 14 through the automatic balance device. In a preferred embodiment, the pipeline fixing platform 12 is a support structure, the bottom of the pipeline test piece 14 is connected to the second connecting tool 152 through a stainless steel screw, the second connecting tool 152 is connected to the low-temperature protection plate 16 through a stainless steel screw, the low-temperature protection plate 16 is mounted on the upper end surface of the movable part of the automatic balance auxiliary supporting device 13 through a stainless steel screw, and the lower end surface of the movable part of the automatic balance auxiliary supporting device 13 is connected to the moving coil of the vibrating table 17 through a stainless steel screw. In a preferred example, the automatic balance auxiliary supporting device 13 is an air bag type vertical pressure self-balancing auxiliary supporting device for vibration test in CN201611025392, an upper end surface of a movable part of the automatic balance auxiliary supporting device 13 is a fixed table surface C1 surface in CN201611025392, and a lower end surface of the movable part of the automatic balance auxiliary supporting device 13 is a fixed table surface C2 surface in CN 201611025392.
The multifunctional control console 1 is connected with the low-temperature liquid storage tank 2 through an air tightness inspection pipe 11, an exhaust pipe 10 is arranged on the low-temperature liquid storage tank 2, and a second switch valve 7 is arranged on the exhaust pipe 10; the bottom and the top of the low-temperature liquid storage tank 2 are respectively provided with a first low-temperature liquid filling pipe 5 and an air pillow pipe 20, and the first low-temperature liquid filling pipe 5 and the air pillow pipe 20 are both communicated with the first connecting tool 151; a first switch valve 3 is arranged on the first low-temperature liquid filling pipe 5; the air pillow pipe 20 is provided with a pressure gauge 6 and a pressure relief pipe 21; the pressure gauge 6 is used for monitoring the pressure in the pipeline test piece 14, and the pressure relief pipe 21 is provided with a third on-off valve 22;
the second filling pipe 18 is communicated with a second connecting tool 152, and a fourth on-off valve 19 is arranged on the second filling pipe 18, preferably, the fourth on-off valve 19 is arranged at the tail end of the second filling pipe 18. The second filling pipe 18 is used for connecting an external low-temperature liquid nitrogen filling device, the low-temperature liquid nitrogen filling device can fill low-temperature liquid into the pipeline test piece 14 through the second filling pipe 18, and the fourth switch valve 19 can be used for controlling the on-off of the filling of the low-temperature liquid. In a preferred embodiment, the second fill pipe 18 is coated with a thermally insulating and cold-retaining layer.
The position of the low-temperature liquid storage tank 2 is higher than the upper end of the pipeline test piece 14, so that low-temperature liquid can flow into the pipeline test piece 14 through the first low-temperature liquid filling pipe 5.
In a preferred embodiment, the cryogenic liquid tank 2 is provided with a safety valve 9, and preferably, the top of the cryogenic liquid tank 2 is provided with the safety valve 9, so that the safety pressure of the safety valve 9 can be adjusted according to the test pressure requirement to ensure that the pressure in the cryogenic liquid tank 2 is stable.
In a preferred embodiment, the fourth switch valve 19 is a mechanical valve, and the pipeline low-temperature vibration testing system further includes a first control line 4, a second control line 8, and a second control line 23; the first switch valve 3, the second switch valve 7 and the third switch valve 22 are all electromagnetic valves, the multifunctional console 1 further comprises a control system, and the first switch valve 3, the second switch valve 7 and the third switch valve 22 are respectively electrically connected with the control system of the multifunctional console 1 through a first control line 4, a second control line 8 and a second control line 23.
In a preferred embodiment, the low temperature protection plate 16 is made of glass fiber reinforced plastic material. The glass fiber reinforced plastic material can prevent the low-temperature liquid from freezing the moving coil of the vibration table 17 and ensure that the vibration excitation generated by the vibration table 17 can be rigidly transmitted to the pipeline test piece 14.
The invention also provides a pipeline low-temperature vibration test method, which adopts the pipeline low-temperature vibration test system and further comprises the following steps:
step 1: and carrying out airtight test on the pipeline low-temperature vibration test system. The step 1 comprises the following steps: closing the fourth switch valve 19, the second switch valve 7 and the third switch valve 22, opening the first switch valve 3, adding nitrogen into the low-temperature liquid storage tank 2 and the pipeline test piece 14 through the air tightness inspection pipe 11 by using the multifunctional console 1, pressurizing to 0.2MPa, closing a nitrogen supply switch of the multifunctional console 1, suspending nitrogen supply, keeping the air pressure for 15min, observing the pressure of the whole test system through a pressure gauge of the multifunctional console 1, if the pressure drop is less than 0.01MPa within 15min, indicating that the air tightness of the whole test system is good, finally opening the third switch valve 22, and removing the pressure of the test system.
Step 2: and carrying out gas replacement on the pipeline low-temperature vibration test system. The step 2 comprises the following steps: and opening the fourth switch valve 19, the second switch valve 7 and the first switch valve 3, and filling nitrogen into the pipeline system by using the multifunctional console 1 to remove water vapor in the pipeline for more than 10 min.
And step 3: filling the pipeline test piece 14 and the low-temperature liquid storage tank 2 with low-temperature liquid; the step 3 comprises the following steps: opening a fourth switch valve 19, a second switch valve 7 and a first switch valve 3, closing a third switch valve 22, connecting a low-temperature liquid nitrogen filling device with a second filling pipe 18, fully pre-cooling the pipeline by using the low-temperature liquid nitrogen filling device (namely slowly filling liquid nitrogen), filling the low-temperature liquid into a pipeline test piece 14 through the second filling pipe 18 by using the low-temperature liquid nitrogen filling device along with the liquid nitrogen filling, then filling the low-temperature liquid into a low-temperature liquid storage tank 2 through a first low-temperature liquid filling pipe 5, when liquid nitrogen is discharged from an exhaust pipe 10, indicating that the test pipeline and the low-temperature liquid storage tank 2 are filled with the liquid nitrogen, and closing the fourth switch valve 19 and the second switch valve 7 to stop the liquid nitrogen filling.
And 4, step 4: the temperature of the pipeline test piece 14 is ensured to be between-196 ℃ and-185 ℃. Specifically, whether the pipeline test piece 14 is filled with the low-temperature liquid or not is judged according to the temperature value of the temperature sensor 24. The step 5 comprises the following steps: after the liquid nitrogen filling and pressurization are finished, whether the temperature of the temperature sensor 24 is between 196 ℃ below zero and 185 ℃ below zero is observed, and if the temperature is higher than the temperature interval, the liquid nitrogen in the pipeline is not full. And opening the first switch valve 3 to enable the liquid nitrogen in the low-temperature liquid storage tank 2 to be filled into the pipeline test piece 14, and ensuring that the pipeline test piece 14 is filled with the liquid nitrogen in the whole test process.
And 5: and pressurizing the pipeline test piece 14, and restoring the initial length of the pipeline test piece 14 by using the automatic balance auxiliary supporting device 13. The step 4 comprises the following steps: closing the second switch valve 7, and pressurizing the pipeline system by means of volatilization of liquid nitrogen in the low-temperature liquid storage tank 2 and the pipeline test piece 14; if the self-pressurization rate of the test system is too low, the test system can be charged with nitrogen through the multifunctional control console 1 to carry out rapid pressurization. In the pressurization process of the pipeline system, the volatilized liquid nitrogen can extend the pipeline test piece 14, and the height of the air bag of the automatic balance auxiliary supporting device 13 is adjusted by adjusting the charging and discharging of the air bag of the automatic balance auxiliary supporting device 13 so as to adjust the position of the lower end of the pipeline test piece, so that the initial length of the pipeline test piece 14 is recovered.
The principle and process of the pipeline test piece 14 to recover the initial length is as follows: when the pipeline test piece 14 extends due to the volatilization process of the liquid nitrogen, the fixed table C1 surface of the automatic balance auxiliary supporting device 13 positioned below the pipeline test piece 14 is driven by the extension of the pipeline test piece 14 to move downwards, and at the moment, the sensor of the automatic balance auxiliary supporting device 13 records the numerical value of downward movement of the fixed table C1 surface (namely the extension amount of the pipeline test piece 14). Under the premise that the position of the upper end of the pipeline test piece 14 is not changed, the height of the air bag of the automatic balance auxiliary supporting device 13 is adjusted according to the value of downward movement of the fixed table top C1, the lower end of the pipeline test piece 14 generates upward displacement by using the automatic balance auxiliary supporting device 13, and the original length of the extended pipeline test piece 14 can be recovered.
Step 6: the pipe specimen 14 is pressure-maintained. In a preferred embodiment, the dwell time is 10 min. Specifically, when the pressure in the pipeline system reaches the test required pressure, the safety valve 9 regulates the pressure in the pipeline system and maintains the pressure.
And 7: and starting the vibration table 17 to apply vibration excitation to the pipeline test piece 14, and simultaneously recording vibration test data through the measuring instrument. Specifically, after the pressure maintaining in step 6 is completed, the vibration table 17 is opened, the vibration table 17 is controlled to apply vibration excitation to the pipeline test piece 14 according to the test conditions, and parameters such as acceleration, strain and temperature are recorded by the measuring instrument.
And 8: and carrying out pressure relief and evacuation on the pipeline low-temperature vibration test system. Specifically, after the test is completed, the second switch valve 7 is opened to release the pressure, when the gauge pressure of the pressure gauge on the cryogenic liquid storage tank 2 is released to 0, the third switch valve 22 is closed, and the fourth switch valve 19 is opened to evacuate the residual liquid nitrogen and nitrogen in the pipeline test piece 14.
The invention provides a pipeline low-temperature vibration test system and method applicable to aerospace products, which can simulate the environment of deep low temperature and high internal pressure, meet the requirement of a coupling test with large acceleration magnitude and provide a real simulation environment for the pipeline low-temperature vibration test of the aerospace products.
The invention realizes the automatic pressure balancing function through the automatic balancing auxiliary supporting device 13, and particularly, in the step 5, when the pipeline test piece 14 is pressurized, the pipeline test piece 14 generates pressure on the automatic balancing auxiliary supporting device 13, and the automatic balancing auxiliary supporting device 13 can balance the partial pressure due to the design of the air bag, thereby preventing the damage of the vibration table 17 caused by the direct loading of the partial pressure on the vibration table 17. Therefore, the invention can effectively balance the pressure of the internal pressure of the pipeline test piece 14 on the vibration table 17 through the automatic balance auxiliary supporting device 13 so as to improve the vibration magnitude.
In addition, the invention effectively prevents the low-temperature fluid from damaging a vibration system (such as a vibration table 17) through the design of a low-temperature protection plate 16 and the like. The pipeline test piece 14 is communicated with the low-temperature liquid storage tank 2 through the air pillow pipe to keep the pressure in the pipeline test piece 14 and the low-temperature liquid storage tank consistent, so that the low-temperature liquid in the low-temperature liquid storage tank can be ensured to be filled into the pipeline test piece 14 at any time. The invention also controls the opening or closing of the electromagnetic valve through the multifunctional control console 1, accurately controls the pressure of the pipeline system, and provides reliable guarantee for the test of the aerospace products and the satisfactory completion of flight tasks of the aerospace products.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but 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 application.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A pipeline low-temperature vibration test system is characterized by comprising a multifunctional control console (1), a low-temperature liquid storage tank (2), a first switch valve (3), a first low-temperature liquid filling pipe (5), a pressure gauge (6), a second switch valve (7), an exhaust pipe (10), an air tightness inspection pipe (11), a pipeline fixing platform (12), an automatic balance auxiliary supporting device (13), a first connecting tool (151), a second connecting tool (152), a low-temperature protection plate (16), a vibration table (17), a second filling pipe (18), a fourth switch valve (19), an air pillow pipe (20), a pressure relief pipe (21), a third switch valve (22) and a temperature sensor (24); the multifunctional console (1) comprises a nitrogen supply system;
the first connecting tool (151) and the second connecting tool (152) are used for fixing the pipeline test piece (14), and the first connecting tool (151) and the second connecting tool (152) are communicated with the pipeline test piece (14); the upper end of a pipeline test piece (14) is fixed on a pipeline fixing platform (12) through a first connecting tool (151), a temperature sensor (24) is arranged on the contact surface of the upper end of the pipeline test piece (14) and the first connecting tool (151), the first connecting tool (151) is not communicated with the pipeline fixing platform (12), the bottom of the pipeline test piece (14) is connected with a low-temperature protection plate (16) through a second connecting tool (152), the second connecting tool (152) is not communicated with the low-temperature protection plate (16), and the low-temperature protection plate (16) is installed on the upper end face of a movable part of an automatic balance auxiliary supporting device (13); the lower end face of a movable part of the automatic balance auxiliary supporting device (13) is connected with a vibrating table (17);
the multifunctional console (1) is connected with the low-temperature liquid storage tank (2) through an air tightness inspection pipe (11), an exhaust pipe (10) is arranged on the low-temperature liquid storage tank (2), and a second switch valve (7) is arranged on the exhaust pipe (10); the bottom and the top of the low-temperature liquid storage tank (2) are respectively provided with a first low-temperature liquid filling pipe (5) and an air pillow pipe (20), and the first low-temperature liquid filling pipe (5) and the air pillow pipe (20) are both communicated with the first connecting tool (151); a first switch valve (3) is arranged on the first low-temperature liquid filling pipe (5); a pressure gauge (6) and a pressure relief pipe (21) are arranged on the air pillow pipe (20), and a third switch valve (22) is arranged on the pressure relief pipe (21);
the second filling pipe (18) is communicated with a second connecting tool (152), and a fourth switch valve (19) is arranged on the second filling pipe (18); the second filling pipe (18) is used for connecting an external low-temperature liquid nitrogen filling device;
the position of the low-temperature liquid storage tank (2) is higher than the upper end of the pipeline test piece (14).
2. Pipeline cryogenic vibration test system according to claim 1, characterized in that a safety valve (9) is provided on the cryogenic liquid tank (2).
3. The pipeline low-temperature vibration test system according to claim 1, further comprising a first control line (4), a second control line (8), a second control line (23);
the multifunctional control console (1) further comprises a control system, the first switch valve (3), the second switch valve (7) and the third switch valve (22) are all electromagnetic valves, and the first switch valve (3), the second switch valve (7) and the third switch valve (22) are respectively electrically connected with the control system of the multifunctional control console (1) through a first control line (4), a second control line (8) and a second control line (23).
4. The pipeline low-temperature vibration test system according to claim 1, wherein the low-temperature protection plate (16) is made of glass fiber reinforced plastic materials.
5. Pipeline cryogenic vibration test system according to claim 1, characterized in that the fourth switching valve (19) is a mechanical valve.
6. A pipeline low-temperature vibration test method, characterized in that the pipeline low-temperature vibration test system of any one of claims 1 to 5 is adopted, and the method further comprises the following steps:
step 1: carrying out an airtight test on the pipeline low-temperature vibration test system;
step 2: performing gas replacement on the pipeline low-temperature vibration test system;
and step 3: filling the pipeline test piece (14) and the low-temperature liquid storage tank (2) with low-temperature liquid;
and 4, step 4: ensuring that the temperature of the pipeline test piece (14) is between-196 ℃ and-185 ℃;
and 5: pressurizing the pipeline test piece (14), and recovering the initial length of the pipeline test piece (14) by using the automatic balance auxiliary supporting device (13);
step 6: maintaining the pressure of the pipeline test piece (14);
and 7: starting a vibration table (17) to apply vibration excitation to the pipeline test piece (14), and recording vibration test data through a measuring instrument;
and 8: and carrying out pressure relief and evacuation on the pipeline low-temperature vibration test system.
7. The pipeline low-temperature vibration test method according to claim 6, wherein the step 1 comprises the following steps:
and (3) closing the fourth switch valve (19), the second switch valve (7) and the third switch valve (22), opening the first switch valve (3), adding nitrogen into the low-temperature liquid storage tank (2) and the pipeline test piece (14) through the air tightness inspection pipe (11) by using the multifunctional console (1), pressurizing to 0.2MPa, keeping the air pressure for 15min, if the pressure drop is less than 0.01MPa within 15min, indicating that the air tightness of the whole test system is good, finally opening the third switch valve (22), and unloading the pressure of the test system.
8. The pipeline low-temperature vibration test method according to claim 6, wherein the step 2 comprises:
and opening the fourth switch valve (19), the second switch valve (7) and the first switch valve (3), and filling nitrogen into the pipeline system by using the multifunctional console (1) to remove water vapor in the pipeline for more than 10 min.
9. The pipeline low-temperature vibration test method according to claim 6, wherein the step 3 comprises:
the fourth switch valve (19), the second switch valve (7) and the first switch valve (3) are opened, the third switch valve (22) is closed, the low-temperature liquid nitrogen filling device is connected with the second filling pipe (18), the pipeline is fully pre-cooled by using the low-temperature liquid nitrogen filling device, along with the filling of the liquid nitrogen, the low-temperature liquid nitrogen filling device fills the low-temperature liquid nitrogen into the pipeline test piece (14) through the second filling pipe (18), and then fills the low-temperature liquid into the low-temperature liquid storage tank (2) through the first low-temperature liquid filling pipe (5), when the liquid nitrogen is discharged from the exhaust pipe (10), the test pipeline and the low-temperature liquid storage tank (2) are filled with the liquid nitrogen, and the fourth switch valve (19) and the second switch valve (7) are closed to stop filling the liquid nitrogen.
10. The pipeline low-temperature vibration test method according to claim 6, wherein the step 5 comprises:
closing the second switch valve (7), and pressurizing the pipeline system by means of volatilization of liquid nitrogen in the low-temperature liquid storage tank (2) and the pipeline test piece (14); in the pressurization process of the pipeline system, the height of the air bag of the automatic balance auxiliary supporting device (13) is adjusted to adjust the position of the lower end of the pipeline test piece, so that the pipeline test piece is restored to the initial length.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117387851A (en) * | 2023-12-13 | 2024-01-12 | 山东菲特自控阀门制造有限公司 | Quality detection equipment for gate valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117387851A (en) * | 2023-12-13 | 2024-01-12 | 山东菲特自控阀门制造有限公司 | Quality detection equipment for gate valve |
| CN117387851B (en) * | 2023-12-13 | 2024-02-23 | 山东菲特自控阀门制造有限公司 | Quality detection equipment for gate valve |
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