High-temperature pipeline and coating vibration test device thereof

Abstract

The invention discloses a high-temperature pipeline and a coating vibration test device thereof. The coating vibration test device comprises a pipeline vibration test bed and a heating temperature control system, the two ends of an austenitic stainless steel pipeline in the pipeline vibration test bench are elastically connected with the ground through spring vibration isolators, a cooling base is installed on the austenitic stainless steel pipeline, and an acceleration sensor is installed on the cooling base and connected with a signal analyzer through a low-noise signal line. The elastic water pipe is connected with the water tank, the water pump and the cooling base to form a circulation loop, the hose clamp is installed at the joint of the cooling base and the elastic water pipe, the vibration exciter is hung on a traveling crane through the elastic rope, and the vibration excitation rod is connected with the vibration exciter and the austenitic stainless steel pipeline. The cladding material is fixed on the austenitic stainless steel pipeline, an air heating pipe in the heating temperature control system is connected with the austenitic stainless steel pipeline through a flange, the PID temperature control box is respectively connected with the sheet type thermocouple and the air heating pipe, and the sheet type thermocouple is embedded in the cladding material.

Description

Technical Field

[0001] This invention relates to the field of high-temperature pipeline vibration testing and evaluation of the vibration absorption effect of coating materials, specifically to a high-temperature pipeline and its coating vibration testing device. Background Technology

[0002] In today's increasingly sophisticated industrial production, the impact of pipeline system vibration and noise on personnel and the environment is receiving more and more attention. Encasing pipelines is an effective way to reduce vibration and noise. Vibration tests on high-temperature pipelines typically use existing pipeline systems to simulate the required pipeline temperature and vibration. However, limitations in the medium, size, structure, and temperature of existing pipelines cannot meet the vibration and temperature control requirements of the test. Furthermore, in high-temperature environments (above 250°C), conventional vibration testing methods cannot measure or accurately measure acceleration levels due to the limited operating temperature range of sensors. Conventional pipeline heating methods involve various circulation devices, which are costly.

[0003] Existing technologies, such as the vibration characteristic testing system under ultra-high temperature conditions disclosed in patent (CN108168810A), use liquid nitrogen to cool the sensor. This results in high cooling medium costs, complex operation, and limited adaptability of the heating method. Patent (CN113804379A) ​​discloses an ultra-high temperature vibration fatigue testing method for composite materials, which relies on indirect heating within a metal cavity. This method is slow and the specimen size is limited by the cavity. These existing technologies fail to meet the practical needs of rapid heating, precise temperature control, convenient operation, and low cost in vibration testing of high-temperature pipelines and their cladding materials.

[0004] In order to accurately simulate the vibration and temperature state of high-temperature pipelines and test the vibration absorption effect of the coating material on the pipeline under specific excitation, it is urgent to develop a high-temperature pipeline and its coating vibration test device with better performance. Summary of the Invention

[0005] To address the problems existing in the aforementioned background technology, this invention proposes a high-temperature pipeline and its encased vibration testing device that combines electric heating technology and high-temperature vibration testing technology. This device features rapid and uniform heating (rapidly raising the temperature to 500℃ in 5 minutes), precise temperature control (target value ±5℃), effective vibration excitation (reproduction accuracy of ±3dB for each frequency band in 1 / 3 octave band), accurate vibration measurement (test error <1dB), high safety, convenient assembly, low cost, and low operating costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature pipeline and its covering vibration testing device, comprising a pipeline vibration testing bench and a heating and temperature control system; the pipeline vibration testing bench includes an austenitic stainless steel pipeline, a spring vibration isolator, a cooling base, an elastic water pipe, a water pump, a water tank, a hose clamp, an acceleration sensor, a low-noise signal line, a signal analyzer, a vibrator, a vibration rod, a power amplifier, a signal generator, and a covering material; the heating and temperature control system includes an air heating pipe, a thin-film thermocouple, and a PID controller. Temperature control box; the austenitic stainless steel pipe is elastically connected to the ground at both ends by spring vibration isolators; the cooling base is installed on the austenitic stainless steel pipe; the acceleration sensor is installed on the cooling base and connected to a signal analyzer via a low-noise signal line; the elastic water pipe connects the water tank, water pump, and cooling base to form a circulation loop; the hose clamp is installed at the connection between the cooling base and the elastic water pipe; the vibrator is suspended on the crane by an elastic rope; the vibration rod connects the vibrator and the austenitic stainless steel pipe; the signal generator is connected to the vibrator via a power amplifier; the covering material is fixed on the austenitic stainless steel pipe; the air heating pipe is connected to the austenitic stainless steel pipe via a flange; the PID temperature control box is connected to the thin-film thermocouple and the air heating pipe respectively; the thin-film thermocouple is embedded in the covering material.

[0007] Furthermore, the austenitic stainless steel pipe is made of S32168 stainless steel, which can withstand high temperatures of 800℃ and maintain its mechanical properties.

[0008] Furthermore, the spring isolator is used to reduce the impedance of the upper structure of the pipeline vibration test bench, so that the effective frequency range of the exciter reaches 2-5000Hz.

[0009] Furthermore, the cooling base is provided with two pipe openings, namely a water inlet and a water outlet, which reduce the surface temperature of the accelerometer by circulating cold water, so that the accelerometer can still work normally when the surface temperature of the pipe exceeds 125°C.

[0010] Furthermore, the air heating tube is provided in two parts, symmetrically installed on the austenitic stainless steel pipe, which can rapidly heat the air from room temperature to 500°C within 5 minutes, and the heating is uniform.

[0011] Furthermore, the PID temperature control box achieves closed-loop temperature control through the feedback signal of a thin-film thermocouple, with a temperature control accuracy of ±5℃.

[0012] Furthermore, the thin-film thermocouple is armored, withstanding temperatures up to 1000℃ throughout, and achieving a temperature measurement accuracy of ±2℃ for the coating material.

[0013] Furthermore, the covering material adopts a snap-on design, which can be easily installed and fixed on austenitic stainless steel pipes.

[0014] Furthermore, the low-noise signal line can reduce the impact of electrical interference noise on data quality, making the test error less than 1dB.

[0015] Furthermore, the signal generator and power amplifier can generate a custom voltage signal to drive the exciter, achieving a reproduction accuracy of ±3dB for each frequency band in a 1 / 3 octave band.

[0016] The beneficial effects of this invention are: 1. Excellent heating performance: It adopts symmetrically installed air heating tubes, which can quickly heat up to 500℃ within 5 minutes and heat evenly, solving the problems of slow heating speed and uneven heating in existing technologies.

[0017] 2. High temperature control accuracy: Through closed-loop control of PID temperature control box and armored thin-film thermocouple, the pipeline temperature control accuracy reaches ±5℃, and the temperature measurement accuracy of the covering material reaches ±2℃, meeting the requirements of high-precision testing.

[0018] 3. Accurate and reliable vibration measurement: The cooling base's cold water circulation design is compatible with the operating temperature of conventional accelerometers. Combined with low-noise signal lines, the test error is less than 1dB, solving the problem of sensors not working properly or measuring inaccurately in high-temperature environments.

[0019] 4. Excellent excitation effect: The spring vibration isolator extends the effective excitation frequency band to 2-5000Hz, and the reproduction accuracy of the 1 / 3 octave band reaches ±3dB, which can accurately simulate the actual pipeline vibration state.

[0020] 5. Convenient and efficient operation: The covering material adopts a snap-on design, which is easy to install and disassemble. The testing time for a set of test pieces can be reduced to within 10 minutes, which greatly improves the testing efficiency.

[0021] 6. Advantages in cost and safety: The electric heating and cold water circulation cooling scheme is lower in cost and operating cost compared to liquid nitrogen cooling and other methods. The structural design is safe and reliable and easy to assemble.

[0022] In summary, the high-temperature pipeline and its covering vibration test device of the present invention has a simple and reasonable structural design. Combining electric heating technology and high-temperature vibration testing technology, it has the characteristics of rapid and uniform heating (rapidly heating to 500℃ in 5 minutes), precise temperature control (target value ±5℃), effective vibration excitation (the accuracy of each frequency band reproduction in 1 / 3 octave band can reach ±3dB), accurate vibration measurement (test error <1dB), high safety, low cost, and low operating cost. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the structural connection principle of the high-temperature pipeline and its covering vibration testing device according to the present invention. Figure 2 This is a schematic diagram of the structure of the high-temperature pipeline and its covering vibration test device according to the present invention; Explanation of markings in the diagram: 2-Pipe vibration test bench, 3-Heating and temperature control system, 4-Austenitic stainless steel pipe, 5-Spring vibration isolator, 6-Cooling base, 7-Elastic water pipe, 8-Water pump, 9-Water tank, 10-Hose clamp, 11-Acceleration sensor, 12-Low noise signal line, 13-Signal analyzer, 14-Vibrator, 15-Vibration rod, 16-Power amplifier, 17-Signal generator, 18-Covering material, 19-Air heating pipe, 20-PID temperature control box. Detailed Implementation

[0024] To make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

[0025] like Figure 1 As shown in Figure 2, a high-temperature pipeline and its covering vibration testing device according to the present invention includes a pipeline vibration test bench 2 and a heating and temperature control system 3. The pipeline vibration test bench 2 includes an austenitic stainless steel pipeline 4, a spring vibration isolator 5, a cooling base 6, an elastic water pipe 7, a water pump 8, a water tank 9, a hose clamp 10, an acceleration sensor 11, a low-noise signal line 12, a signal analyzer 13, a vibrator 14, a vibration rod 15, a power amplifier 16, a signal generator 17, and a covering material 18; the heating and temperature control system includes an air heating pipe 19, a thin-film thermocouple, and a PID temperature control box 20.

[0026] The austenitic stainless steel pipe 4 is elastically connected to the ground at both ends by spring vibration isolators 5. The austenitic stainless steel pipe 4 is made of S32168 stainless steel, which can withstand high temperature of 800℃ and maintain its mechanical properties.

[0027] Spring isolators 5 can reduce the impedance of the upper structure of the pipeline vibration test bench and increase the effective frequency band of the exciter.

[0028] The cooling base 6 is mounted on the austenitic stainless steel pipe 4, and the accelerometer 11 is mounted on the cooling base 6. The cooling base 6 has two ports, one for water inlet and one for water outlet. The effective temperature range of the accelerometer 11 is -55℃ to 125℃, while the surface temperature of the pipe after heating is usually greater than 125℃. The cooling base 6 uses cold water for circulation, which effectively reduces the surface temperature of the accelerometer 11.

[0029] The flexible water pipe 7 is used to connect the water tank 9 and the water pump 8, the water pump 8 and the cooling base 6, and the cooling base 6 and the water tank 7, forming a loop. The flexible water pipe 7 can reduce the impact of the water pipe structure on local modes and improve data quality.

[0030] The hose clamp 10 is installed at the connection between the cooling base 6 and the flexible water pipe 7, which can effectively prevent water pipe leakage.

[0031] The low-noise signal line 12 connects the accelerometer 11 and the signal analyzer 13, reducing the impact of electrical interference and other noise on data quality, with a test error of <1dB.

[0032] The signal analyzer 13 can perform AD conversion on voltage signals and analyze their spectrum to obtain the vibration absorption effect.

[0033] The vibrator 14 is suspended on the crane by an elastic rope to simulate the vibration of actual pipelines. In the free state, the excitation force of the vibrator is closer to the original value.

[0034] The excitation rod 15 connects the exciter 14 and the austenitic stainless steel pipe 4, and can effectively transmit the excitation force of the exciter 14 to the pipe vibration test bench.

[0035] The signal generator 17 is connected to the power amplifier 16 via a signal line, and the power amplifier 16 is connected to the exciter 14 via a cable. Through specific program settings, the power amplifier 16 and the signal generator 17 can generate a custom voltage signal to drive the exciter 14, simulating pipeline vibration in a real environment. The reproduction accuracy of each frequency band in a 1 / 3 octave band can reach ±3dB.

[0036] The covering material 18 can be easily installed and fixed to the austenitic stainless steel pipe 4 through the snap-on design.

[0037] The air heating tube 19 is connected to the austenitic stainless steel pipe 4 through a flange, which can achieve rapid heating in 5 minutes (from room temperature to 500℃). The two air heating tubes 19 are installed symmetrically to achieve uniform heating.

[0038] The PID temperature control box 20 is connected to a thin-film thermocouple and an air heating tube 19, and the temperature can be controlled within ±5℃ of the target value through feedback control.

[0039] The thin-film thermocouple is embedded in the covering material 19, and the temperature measurement accuracy of the covering material 19 reaches ±2℃. The wire is armored and can withstand 1000℃ throughout.

Claims

1. A high-temperature pipeline and its covering vibration testing device, characterized in that, The system includes a pipeline vibration test bench and a heating and temperature control system. The pipeline vibration test bench includes austenitic stainless steel pipes, spring isolators, a cooling base, elastic water pipes, a water pump, a water tank, hose clamps, an accelerometer, a low-noise signal line, a signal analyzer, a vibrator, a vibration rod, a power amplifier, a signal generator, and a covering material. The heating and temperature control system includes an air heating pipe, a thin-film thermocouple, and a PID temperature control box. The austenitic stainless steel pipes are elastically connected to the ground at both ends via spring isolators. The cooling base is mounted on the austenitic stainless steel pipes, and the accelerometer is mounted on the cooling base. The signal analyzer is connected via a low-noise signal line. The elastic water pipe connects the water tank, water pump, and cooling base to form a circulation loop. The hose clamp is installed at the connection between the cooling base and the elastic water pipe. The vibrator is suspended on the crane by an elastic rope. The vibrator rod connects the vibrator and the austenitic stainless steel pipe. The signal generator is connected to the vibrator via a power amplifier. The covering material is fixed on the austenitic stainless steel pipe. The air heating pipe is connected to the austenitic stainless steel pipe via a flange. The PID temperature control box is connected to the thin-film thermocouple and the air heating pipe respectively. The thin-film thermocouple is embedded in the covering material.

2. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The austenitic stainless steel pipe is made of S32168 stainless steel, which can withstand high temperatures of 800℃ and maintain its mechanical properties.

3. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The spring isolator is used to reduce the impedance of the upper structure of the pipeline vibration test bench, so that the effective frequency range of the exciter can reach 2-5000Hz.

4. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The cooling base has two ports, namely a water inlet and a water outlet. By circulating cold water, the surface temperature of the accelerometer is reduced, so that the accelerometer can still work normally when the surface temperature of the pipe exceeds 125°C.

5. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The air heating tubes are provided in two, symmetrically installed on the austenitic stainless steel pipe, which can rapidly heat the air from room temperature to 500°C within 5 minutes, and the heating is uniform.

6. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The PID temperature control box achieves closed-loop temperature control through feedback signals from a thin-film thermocouple, with a temperature control accuracy of ±5℃.

7. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The thin-film thermocouple is armored, withstanding temperatures up to 1000℃ throughout, and achieving a temperature measurement accuracy of ±2℃ for the coating material.

8. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The covering material adopts a snap-on design, which can be easily installed and fixed on austenitic stainless steel pipes.

9. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The low-noise signal line can reduce the impact of electrical interference noise on data quality, making the test error less than 1dB.

10. The high-temperature pipeline and its covering vibration testing device according to claim 1, characterized in that, The signal generator and power amplifier can generate a custom voltage signal to drive the exciter, achieving a reproduction accuracy of ±3dB for each frequency band in a 1 / 3 octave band.

Images