Cryogenic liquid pipeline vibration demonstration system
By installing sensors in cryogenic liquid pipelines to collect data, the problem of lack of dynamic analysis in the design of liquid fuel delivery pipelines is solved, enabling effective testing and analysis of vibration in cryogenic liquid pipelines and preventing pipeline structural damage.
Patent Information
- Application Number
- CN202422717172.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-11-07
AI Technical Summary
Existing technologies lack fluid-structure interaction dynamics analysis in the engineering design of liquid fuel transportation pipelines, which makes the pipeline structure prone to fatigue damage and fracture due to long-term vibration, especially when the excitation force is equal to or close to the natural frequency of the liquid pipeline, resulting in severe resonance.
A vibration demonstration system for cryogenic liquid pipelines was designed, including the pipeline under test, a liquid nitrogen storage tank, and sensors. By setting pressure, temperature, and vibration sensors in the pipe sections before and after each valve in the pipeline, dynamic characteristic data of the cryogenic liquid pipeline during operation are collected.
It enables effective testing of vibration in cryogenic liquid pipelines, collects and analyzes pressure, temperature and vibration data of the pipelines, prevents pipeline structural damage, and improves the accuracy and safety of design.
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Figure CN223884095U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the field of engineering test technology, in particular to a low-temperature liquid pipeline vibration demonstration system. BACKGROUND
[0002] Liquid pipelines are one of the most important components of a spacecraft and are widely used in the fields of communication satellites, deep space exploration, manned spaceflight and reusable spacecraft, wherein low-temperature liquid pipelines are one of the most typical liquid pipelines of a spacecraft.
[0003] During the launch and flight of a spacecraft, liquid pipelines in a power system produce severe vibration due to various exciting forces. Long-time vibration can cause fatigue damage of the pipeline structure, and especially when the exciting force frequency is equal to or close to the natural frequency of the liquid pipeline, resonance occurs, and the pipeline is prone to rupture and damage due to excessive dynamic stress. Therefore, when calculating the dynamic characteristics of a pressure pipeline, the influence of the fluid in the pipeline on the dynamic characteristics of the pipeline structure should be considered.
[0004] At present, there is a lack of necessary fluid-structure coupling dynamics analysis in the engineering design process of liquid fuel delivery pipelines, and after the actual work problem occurs, a lot of effort is needed to modify the related dynamic characteristics. CONTENT OF THE INVENTION
[0005] The application provides a low-temperature liquid pipeline vibration demonstration system, which can test the dynamic characteristics of a low-temperature liquid pipeline during operation.
[0006] The system comprises a pipeline to be tested, a first liquid nitrogen storage tank and a second liquid nitrogen storage tank.
[0007] The liquid inlet of the pipeline to be tested is connected to the first liquid nitrogen storage tank, the liquid outlet of the pipeline to be tested is connected to the second liquid nitrogen storage tank, the pipeline to be tested comprises a plurality of branches, each valve and a pipe section connecting the valves are included in the plurality of branches.
[0008] The front pipe section and the rear pipe section of each valve are provided with a pressure sensor, a temperature sensor and / or a vibration sensor connected to a data acquisition instrument.
[0009] In a possible implementation, in the pipeline to be tested, the liquid outlet is connected to the inlet of a low-temperature pump through a first stop valve; the outlet of the low-temperature pump is connected to the first dry road and the second dry road of the pipeline to be tested, respectively; the first dry road and the second dry road are connected to the liquid outlet end of the pipeline to be tested through a plurality of branches, respectively.
[0010] In a possible implementation, in the pipe to be tested, the liquid outlet is connected to the inlet of the cryogenic pump through a first stop valve; the outlet of the cryogenic pump is connected to the first dry line and the second dry line of the pipe to be tested respectively; the first dry line and the second dry line are connected to the liquid outlet end of the pipe to be tested through a plurality of branches respectively.
[0011] In a possible implementation, the outlet of the cryogenic pump is connected to the first regulating valve in the first dry line.
[0012] The first regulating valve in the first dry line is connected to the second stop valve in the first branch; the second stop valve is connected to the third stop valve through a first pipe section; the third stop valve is connected to the liquid outlet end of the pipe to be tested through a second pipe section.
[0013] In a possible implementation, the first pipe section is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0014] In a possible implementation, the first regulating valve in the first dry line is further connected to a first blind branch through a first electric valve; the first blind branch is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0015] In a possible implementation, the outlet of the cryogenic pump is connected to the second regulating valve in the second dry line.
[0016] The second regulating valve in the second dry line is connected to the third stop valve in the second branch; the third stop valve is connected to the fourth stop valve through a third pipe section; the fourth stop valve is connected to the liquid outlet end of the pipe to be tested through a fourth pipe section.
[0017] In a possible implementation, the third pipe section is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0018] In a possible implementation, the second regulating valve in the second dry line is further connected to a second blind branch through a second electric valve; the second blind branch is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0019] The technical scheme provided in the application can have the following beneficial effects:
[0020] The embodiment of the application provides a low-temperature liquid pipeline vibration demonstration system, the system comprises a to-be-tested pipeline, a first liquid nitrogen storage tank and a second liquid nitrogen storage tank; the liquid inlet of the to-be-tested pipeline is connected with the first liquid nitrogen storage tank; the liquid outlet of the to-be-tested pipeline is connected with the second liquid nitrogen storage tank; the to-be-tested pipeline comprises a plurality of branches; the plurality of branches comprise valves and pipe sections connected with the valves; the front pipe section and the rear pipe section of each valve are provided with pressure sensors, temperature sensors and / or vibration sensors connected with a data acquisition instrument. That is, the low-temperature liquid pipeline vibration demonstration system provided by the above scheme can set the to-be-tested pipeline according to requirements, and sensors are arranged on the front and rear pipe sections of each valve of the to-be-tested pipeline, so that the sensor data of the to-be-tested pipeline flowing through the low-temperature liquid is collected, and the test on the kinetic characteristics in the operation process of the low-temperature liquid pipeline is realized. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0022] Figure 1 It is a structure schematic diagram of a low-temperature liquid pipeline vibration demonstration system according to an exemplary embodiment.
[0023] Figure 2 The specific structure diagram of a low-temperature liquid pipeline vibration demonstration system related to the embodiment of the present application is shown. DETAILED DESCRIPTION
[0024] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0025] In the description of the embodiments of the present application, the term "corresponding" can represent a direct or indirect corresponding relationship between the two, can also represent an associated relationship between the two, or can indicate a relationship such as indication and configuration.
[0026] Figure 1 It is a structure schematic diagram of a low-temperature liquid pipeline vibration demonstration system according to an exemplary embodiment. As shown in Figure 1 The system comprises a to-be-tested pipeline, a first liquid nitrogen storage tank and a second liquid nitrogen storage tank;
[0027] The liquid inlet (liquid inlet end) of the to-be-tested pipeline is connected with the first liquid nitrogen storage tank; the liquid outlet (liquid outlet end) of the to-be-tested pipeline is connected with the second liquid nitrogen storage tank; the to-be-tested pipeline includes a plurality of branches; each valve and a pipe segment connecting each valve are included in the plurality of branches.
[0028] The front pipe segment and the rear pipe segment of each valve are provided with a pressure sensor, a temperature sensor and / or a vibration sensor connected with the data acquisition instrument.
[0029] The low-temperature liquid pipeline vibration demonstration system shown in the embodiments of the present application is used for measuring the vibration, pressure and temperature parameters of low-temperature liquid in a pipeline. Optionally, the demonstration system is a skid-mounted type, mainly composed of a low-temperature pump, valves, pipelines and measurement components, and an interface (i.e. the liquid inlet and the liquid outlet of the to-be-tested pipeline) connected with a low-temperature storage tank needs to be reserved on the platform.
[0030] As shown in Figure 1 , the liquid inlet end and the liquid outlet end are both provided with low-temperature liquid storage tanks (i.e. the first liquid nitrogen storage tank and the second liquid nitrogen storage tank), which can be used for system circulation.
[0031] In the embodiments of the present application, the pipeline structure of the to-be-tested pipeline can be adaptively set according to test requirements. When a developer designs a pipeline structure, the to-be-tested pipeline in the demonstration system can be set to the pipeline structure, and the pressure sensor, the temperature sensor and / or the vibration sensor connected with the data acquisition instrument can be set on the front pipe segment and the rear pipe segment of each valve of the pipeline structure.
[0032] At this time, the developer can open the valve of the first liquid nitrogen storage tank, so that the low-temperature liquid nitrogen flows in from the liquid inlet of the to-be-tested pipeline, flows out from the liquid outlet of the to-be-tested pipeline to the second liquid nitrogen storage tank after passing through each pipe of the to-be-tested pipeline. In the transmission process of the low-temperature liquid nitrogen, the pressure sensor, the temperature sensor and / or the vibration sensor collect the data of each pipe segment and transmit the data to the data acquisition instrument, thereby realizing the test of the low-temperature liquid pipeline.
[0033] Please refer to Figure 2 , which shows a specific structure diagram of a low-temperature liquid pipeline vibration demonstration system according to an embodiment of the present application. As shown in Figure 2 , in the to-be-tested pipeline, the liquid outlet (liquid outlet end) is connected to the inlet of the low-temperature pump 202 through the first stop valve 201; the outlet of the low-temperature pump 202 is connected to the first dry circuit and the second dry circuit of the to-be-tested pipeline respectively; the first dry circuit and the second dry circuit are connected to the liquid outlet end of the to-be-tested pipeline through a plurality of branches respectively.
[0034] Further, the outlet of the low-temperature pump is connected to the first regulating valve 203 in the first dry circuit;
[0035] The first regulating valve 203 in the first dry route is connected to the second stop valve 204 in the first branch; the second stop valve 204 is connected to the third stop valve 205 through a first pipe segment; and the third stop valve 205 is connected to the liquid outlet end of the pipeline to be tested through a second pipe segment.
[0036] Further, the first pipe segment is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0037] Further, the first regulating valve 203 in the first dry route is also connected to a first blind branch through a first electric valve 206; and the first blind branch is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0038] Further, the outlet of the low-temperature pump 202 is connected to the second regulating valve 207 in the second dry route.
[0039] The second regulating valve 207 in the second dry route is connected to the third stop valve 208 in the second branch; the third stop valve 208 is connected to the fourth stop valve 209 through a third pipe segment; and the fourth stop valve 209 is connected to the liquid outlet end of the pipeline to be tested through a fourth pipe segment.
[0040] Further, the third pipe segment is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0041] Further, the second regulating valve in the second dry route is also connected to a second blind branch through a second electric valve 210; and the second blind branch is provided with a pressure sensor, a temperature sensor and a vibration sensor.
[0042] It should be noted that the above only describes part of the structure of the pipeline to be tested as shown in Figure 2 The connection of the remaining structure is similar to the above description, and only the pipe size used is different to test the dynamic characteristics of pipes of different sizes flowing through low-temperature liquid, which will not be described here.
[0043] As shown in Figure 2 The inlet end and the outlet end of the embodiment are both provided with a low-temperature liquid storage tank for system circulation. The low-temperature liquid pipeline vibration demonstration system includes a low-temperature pump for providing energy, a flow meter for measuring flow, sensors for measuring important parameters such as vibration, pressure and temperature, and polyurethane foaming pipes of different diameters.
[0044] A high-frequency high-pressure sensor is arranged at the DN50 blind branch, and a vibration sensor is arranged on the outer wall of the blind branch. At the same time, a plurality of temperature, pressure and vibration sensors are arranged at different positions of the pipeline, and in addition, pressure sensors, vibration sensors and temperature sensors are arranged before and after the valve, and a vibration sensor is arranged at the valve. According to Figure 2The installation is shown, open the low temperature pump and data acquisition instrument, etc., the low temperature liquid enters the polyurethane foaming pipeline through the liquid inlet end, the pressure sensor, the temperature sensor and the vibration sensor transmit signals to the data acquisition instrument, so as to realize the measurement of the pressure, the flow rate, the temperature and the vibration of the low temperature pipeline.
[0045] Optionally, in the embodiment of the present application, the low temperature pump can adopt a liquid nitrogen delivery pump, which can be a single-stage horizontal centrifugal pump, with the parameters of maximum flow 10000L / h, head ≥160m, design temperature-196℃, pump rotating speed not less than 2950r / min, and maximum working pressure 1MPa.
[0046] Optionally, in the embodiment of the present application, a flow meter can also be arranged on the first dry circuit and the second dry circuit, which can be a low temperature balanced orifice flow meter, with the parameters of 0-5000L / h, accuracy ±0.5%, flow coefficient repeatability ≤0.2%, fluid Reynolds number 2*102-1*107, and range ratio 3:1-10:1.
[0047] Optionally, in the embodiment of the present application, the parameters of the vibration sensor are-196-+200℃, axial sensitivity (20±5℃) 0-10pC / g, maximum lateral sensitivity ≤5%, frequency response 5%:5-8000Hz, installation resonance frequency 30000Hz, working range: 1000g (resistant to impact 3 million g), magnetic sensitivity: 0-1g / T.
[0048] Optionally, in the embodiment of the present application, the parameters of the temperature sensor are PT100, armored type, -196-+50℃, accuracy: ±15mK@77K, four-wire system, standard curve: IEC751, recommended excitation current 1mA, recommended dissipation under excitation: 100μW@273K, response time: 1.5S@77K, 10S@273K.
[0049] Optionally, in the embodiment of the present application, the parameters of the pressure sensor are 0-5.5MPa, accuracy: ±0.075%, response time <1 nanosecond, peak impact current: 5000A, peak transient voltage 100Vdc, loop impedance <25 ohms, total response time 100 milliseconds, dead time 45 milliseconds, refresh rate: not less than 22 times per second, process connection: 1 / 2NPT thread, liquid crystal display, 4-20mA+hart output, diaphragm material 316L.
[0050] As Figure 2As shown, the embodiments of the present application can adopt pipes of various sizes such as DN15-DN50 and valves to construct the pipe to be tested shown in the embodiments of the present application. In the embodiments of the present application, the platform size of the low-temperature liquid pipe vibration demonstration system is about 2.5m*1.5m, and the pipe diameter is mainly small pipe diameter liquid pipe with DN50, DN25, DN20 and DN15. The demonstration system has small floor area, and the designed pipe is more consistent with the on-orbit operation of the spacecraft.
[0051] In summary, the embodiments of the present application provide a low-temperature liquid pipe vibration demonstration system, which comprises a pipe to be tested, a first liquid nitrogen storage tank and a second liquid nitrogen storage tank. The liquid inlet of the pipe to be tested is connected with the first liquid nitrogen storage tank, and the liquid outlet of the pipe to be tested is connected with the second liquid nitrogen storage tank. The pipe to be tested comprises a plurality of branches. The plurality of branches comprise valves and pipe sections connecting the valves. The front pipe section and the rear pipe section of each valve are provided with pressure sensors, temperature sensors and / or vibration sensors connected with a data acquisition instrument. That is, the low-temperature liquid pipe vibration demonstration system provided by the above-mentioned scheme can set the pipe to be tested according to the demand, and set sensors on the front and rear pipe sections of each valve of the pipe to be tested, so as to collect sensor data when the low-temperature liquid flows through the pipe to be tested, and realize the test of the dynamic characteristics of the low-temperature liquid pipe during operation.
[0052] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the claims and their equivalents. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the application indicated by the following claims.
[0053] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application.
Claims
1. A vibration demonstration system for cryogenic liquid pipelines, characterized in that, The system includes the pipeline to be tested, a first liquid nitrogen storage tank, and a second liquid nitrogen storage tank; The inlet of the pipeline under test is connected to the first liquid nitrogen storage tank; the outlet of the pipeline under test is connected to the second liquid nitrogen storage tank; the pipeline under test includes several branches; the several branches include various valves and pipe sections connecting the various valves; Each valve is equipped with a pressure sensor, temperature sensor, and / or vibration sensor connected to a data acquisition instrument in its front and rear pipe sections. In the pipeline under test, the outlet is connected to the inlet of the cryogenic pump through a first shut-off valve; the outlet of the cryogenic pump is connected to the first main line and the second main line of the pipeline under test respectively; the first main line and the second main line are respectively connected to the outlet end of the pipeline under test through several branches.
2. The system according to claim 1, characterized in that, The outlet of the cryogenic pump is connected to the first regulating valve in the first main circuit; The first regulating valve in the first main circuit is connected to the second shut-off valve in the first branch circuit; the second shut-off valve is connected to the third shut-off valve through the first pipe section; the third shut-off valve is connected to the liquid outlet of the pipeline under test through the second pipe section.
3. The system according to claim 2, characterized in that, The first pipe section is equipped with a pressure sensor, a temperature sensor, and a vibration sensor.
4. The system according to claim 2, characterized in that, The first regulating valve in the first main line is also connected to the first blind branch pipe via a first electric valve; the first blind branch pipe is equipped with a pressure sensor, a temperature sensor and a vibration sensor.
5. The system according to claim 1, characterized in that, The outlet of the cryogenic pump is connected to the second regulating valve in the second main circuit; The second regulating valve in the second main circuit is connected to the third shut-off valve in the second branch circuit; the third shut-off valve is connected to the fourth shut-off valve through the third pipe section; the fourth shut-off valve is connected to the liquid outlet of the pipeline under test through the fourth pipe section.
6. The system according to claim 5, characterized in that, The third pipe section is equipped with a pressure sensor, a temperature sensor, and a vibration sensor.
7. The system according to claim 5, characterized in that, The second regulating valve in the second main line is also connected to the second blind branch pipe via a second electric valve; the second blind branch pipe is equipped with a pressure sensor, a temperature sensor and a vibration sensor.