Testing and evaluation system and method for testing vibration characteristics of valve internal components by non-contact measurement

Abstract

The invention discloses a testing and evaluation system and method for testing the vibration characteristics of valve internal components in a non-contact measurement manner, comprising a data processing system, an air storage tank, a cold dryer, a laser vibrometer, a measuring device and a valve disc vibration measuring device; the outlet of the air storage tank is connected to the inlet of a valve to be tested via the cold dryer, a laser testing window is arranged on the shell of the valve to be tested, a laser reflective paper is pasted on the valve disc in the valve to be tested, and the laser emitted by the laser vibrometer passes through the laser testing window and irradiates the laser reflective paper; a force sensor and a valve stem vibration sensor are arranged on the valve stem of the valve to be tested; the data processing system is connected to the valve disc vibration measuring device, the force sensor, the valve stem vibration sensor and the measuring device via a data acquisition system, and the system and method are used to evaluate whether the loading force of the valve plays a role in suppressing the vibration of the test valve.

Description

Technical Field

[0001] The present invention belongs to the fields of petrochemical industry and power generation equipment, and relates to a testing and evaluation system and method for testing the vibration characteristics of internal components of a valve by a non-contact measurement method. Background Art

[0002] Regulating valves are widely used in the fields of petrochemical industry and power generation, and play a role in regulating the internal flow of pipelines. For the regulating valves in power plants, they are located between the main steam pipeline and the steam turbine and work in extremely harsh high-temperature and high-pressure environments. The regulating valve is the weakest link in the steam flow system, and unstable flow inside the valve is extremely likely to induce the vibration of the valve stem system of the regulating valve. The vibration of the valve stem system of the regulating valve can cause the upper-end thread of the valve stem to slip, the valve stem to break, the linear variable differential transformer (LVDT) of the regulating valve to break, and the DEH oil pipeline system to be damaged. These damages will not only prevent the unit from operating normally and stably, but may also cause the unit to shut down abnormally in severe cases. As the core component for controlling the steam flow of a thermal power plant, the regulating valve directly affects the economy and safety of the unit.

[0003] The loading force of the valve plays an important role in suppressing the vibration of the valve and the selection of the oil motor. Limited by the on-site high-temperature and high-pressure environment, it is impossible to conduct a comprehensive experimental study on the regulating valve. The scaled model test is one of the main methods for studying the vibration of the regulating valve. In the scaled model test, compressed air is used to replace high-temperature and high-pressure steam to test and obtain the flow and vibration characteristics of the regulating valve. The vibration of the regulating valve mainly tests the vibration characteristics of the valve stem, and then uses the similarity scaling method to convert to actual parameters. However, the component directly excited by the fluid is the valve disc of the regulating valve. The valve disc and the valve stem are attached together through the airflow loading force, and the valve disc and the valve stem are in a variable-contact and variable-loading contact mode. There must be a certain degree of attenuation when the vibration is transmitted from the valve disc to the valve stem. Relying solely on the traditional tests of the valve stem vibration and lifting force is not sufficient to reflect the vibration characteristics of the fluid-induced regulating valve and the inhibitory effect of the loading force on the vibration, and it is impossible to effectively promote the conversion of the scaled model test results to actual results, hindering the progress of valve-related research. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provides a testing and evaluation system and method for testing the vibration characteristics of internal components of a valve by a non-contact measurement method, which can comprehensively evaluate whether the loading force of the valve plays an inhibitory role in the vibration of the valve stem system of the valve to be tested.

[0005] To achieve the above purpose, the testing and evaluation system for testing the vibration characteristics of internal components of a valve by a non-contact measurement method according to the present invention includes a data acquisition system, an air storage tank, a refrigerant dryer, a laser vibrometer, a measuring device for detecting the pressure, temperature and flow rate at the inlet and outlet of the valve to be tested and the pressure on the unloading chamber, and a valve disc vibration measuring device for detecting the vibration information of the valve disc in the valve to be tested;

[0006] The outlet of the gas storage tank is connected to the inlet of the valve to be tested through a refrigerant dryer. A laser test window is provided on the housing of the valve to be tested, and a laser reflective paper is pasted on the valve disc in the valve to be tested. The laser emitted by the laser vibrometer passes through the laser test window and irradiates onto the laser reflective paper;

[0007] A force sensor and a valve stem vibration sensor are provided on the valve stem of the valve to be tested;

[0008] The data acquisition system is connected to the valve disc vibration measuring device, the force sensor, the valve stem vibration sensor and the measuring device.

[0009] It further includes a temperature measuring device for measuring the temperature at the inlet and outlet of the valve to be tested. The temperature measuring device is connected to the data processing system through the data acquisition system.

[0010] It further includes a flow measuring device for measuring the gas flow at the outlet and inlet of the valve to be tested. The flow measuring device is connected to the data processing system through the data acquisition system.

[0011] It further includes a compressor and a purification device. Among them, the outlet of the compressor is connected to the gas storage tank through the purification device.

[0012] It further includes a first bypass pipeline connected to the outlet of the refrigerant dryer and a second bypass pipeline connected to the outlet of the compressor. Among them, a first bypass valve is provided on the bypass pipeline, and a second bypass valve is provided on the second bypass pipeline.

[0013] It further includes a tripod for supporting the laser vibrometer.

[0014] A through hole is provided on the valve housing of the valve to be tested, and a transparent glass is installed in the through hole to serve as the laser test window. The transparent glass and the valve housing are adhesively bonded and sealed.

[0015] The laser reflective paper is adhesively bonded to the valve disc.

[0016] The vibration sensor is an acceleration sensor or a velocity sensor.

[0017] The method for testing and evaluating the vibration characteristics of the internal components of the valve by the non-contact measurement method of the present invention includes the following steps:

[0018] The air flow output from the gas storage tank enters the valve to be tested. The laser vibrometer is turned on, and the position of the laser vibrometer is adjusted so that the laser emitted by the laser vibrometer passes through the laser test window and irradiates onto the laser reflective paper;

[0019] The data acquisition system measures the vibration signal of the valve disc in the valve to be tested through the valve disc vibration measuring device, measures the vibration signal of the valve stem through the valve stem vibration sensor, measures the lifting force signal of the valve stem through the force sensor, detects the pressure signal of the unloading chamber through the measuring device, and determines whether the valve loading force of the valve to be tested plays a role in suppressing the valve vibration of the valve to be tested based on the valve disc vibration information, the vibration signal of the valve stem, the lifting force signal of the valve stem, and the pressure signal of the unloading chamber, so as to complete the test and vibration evaluation of the vibration characteristics of the internal components of the valve by the non-contact measurement method.

[0020] The present invention has the following beneficial effects:

[0021] When the test and evaluation system and method for the vibration characteristics of the internal components of the valve by the non-contact measurement method of the present invention are specifically operated, the air is supplied to the valve to be tested through the gas storage tank, the vibration signal of the valve disc in the valve to be tested is measured through the valve disc vibration measuring device, the vibration signal of the valve stem is measured through the valve stem vibration sensor, the lifting force signal measured by the force sensor, the pressure signal of the unloading chamber is detected through the measuring device, and it is judged whether the valve loading force of the valve to be tested plays a role in suppressing the valve vibration of the valve to be tested, so as to complete the test and vibration evaluation of the vibration characteristics of the internal components of the valve by the non-contact measurement method, and solve the need to directly obtain the vibration characteristics of the valve disc in the valve modeling test, thereby laying a foundation for the evaluation of the valve loading force and the improvement of the valve vibration modeling test method. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a position diagram of the valve 5 to be tested and the laser vibrometer 8 in the present invention.

[0024] Among them, 1 is a compressor, 2 is a purification device, 3 is a gas storage tank, 4 is a refrigerated dryer, 5 is a valve to be tested, 6 is a first bypass valve, 7 is a second bypass valve, 8 is a laser vibrometer, 9 is a measuring device, 10 is a force sensor, 11 is a valve stem, 12 is a laser reflective paper, 13 is a valve stem vibration sensor, 14 is a laser test window, and 15 is a valve disc. Specific Embodiments

[0025] The following further describes the present invention in detail with reference to the drawings:

[0026] Refer to Figure 1 and Figure 2, the test and evaluation system for measuring the vibration characteristics of the internal components of the valve by the non-contact measurement method of the present invention includes a data acquisition system, a gas storage tank 3, a cold dryer 4, a laser vibrometer 8, a measuring device 9 for detecting the pressure, temperature and flow rate at the inlet and outlet of the valve 5 to be tested and the pressure on the unloading chamber, and a valve disc vibration measuring device for detecting the vibration information of the valve disc 15 in the valve 5 to be tested; the outlet of the gas storage tank 3 is connected to the inlet of the valve 5 to be tested through the cold dryer 4, a laser test window 14 is provided on the housing of the valve 5 to be tested, a laser reflective paper 12 is pasted on the valve disc 15 in the valve 5 to be tested, and the laser emitted by the laser vibrometer 8 passes through the laser test window 14 and irradiates on the laser reflective paper 12; a force sensor 10 and a valve stem vibration sensor 13 are provided on the valve stem 11 of the valve 5 to be tested; the data acquisition system is connected to the valve disc vibration measuring device, the force sensor 10, the valve stem vibration sensor 13, the pressure, temperature and flow rate.

[0027] The laser vibrometer 8 is arranged on a tripod, and the laser safety level emitted by the laser vibrometer 8 should reach Class II, and the output power is less than 1 mW to ensure the safety of the human eye; the test distance of the laser vibrometer 8 needs to be at least greater than 0.3 m, the resolution of the measurement of the laser vibrometer 8 ≤ 0.02 μm.s-1 / Hz, the measurement peak value needs to be ≥ 100 mm / s, and the minimum frequency resolution ≥ 5 kHz;

[0028] The present invention further includes a temperature measuring device for measuring the temperature at the inlet and outlet of the valve 5 to be tested, and the temperature measuring device records data through the data acquisition system.

[0029] The present invention further includes a flow rate measuring device for measuring the gas flow rate at the outlet and inlet of the valve 5 to be tested, and the flow rate measuring device records data through the data acquisition system.

[0030] The present invention further includes a compressor 1 and a purification device 2, wherein the outlet of the compressor 1 is connected to the gas storage tank 3 through the purification device 2.

[0031] The present invention further includes a first bypass pipe connected to the outlet of the cold dryer 4 and a second bypass pipe connected to the outlet of the compressor 1, wherein a first bypass valve 6 is provided on the bypass pipe, and a second bypass valve 7 is provided on the second bypass pipe.

[0032] A through hole is opened on the valve housing of the valve 5 to be tested, and a transparent glass is installed in the through hole to serve as the laser test window 14. The transparent glass is adhesively bonded and sealed with the valve housing, wherein the diameter of the through hole is greater than 10 mm.

[0033] The valve stem vibration sensor 13 is an acceleration sensor or a velocity sensor; the valve disc vibration measuring device measures the vibration of the valve disc 15 according to the Doppler interference principle.

[0034] The test and evaluation method for the vibration characteristics of the internal components of the valve by non-contact measurement method includes the following steps:

[0035] 1) Stick the laser reflective paper 12 at the valve disc 15, and the position of the laser reflective paper 12 is flush with the laser test window 14;

[0036] 2) Adjust the valve opening of the valve 5 to be tested;

[0037] 3) Turn on the compressor 1 and the refrigerant dryer 4, and adjust the intake air flow into the valve 5 to be tested through the first bypass valve 6 and the second bypass valve 7;

[0038] 4) Obtain the pressure ratio between the inlet and the outlet of the valve 5 to be tested by measuring the pressures at the pressure measurement points at the inlet and outlet of the measuring device;

[0039] 5) Detect the flow rate entering the valve through the measuring device to obtain the flow rate of the valve 5 to be tested;

[0040] 6) Detect the temperatures at the inlet and outlet of the valve through the measuring device to obtain the temperatures at the inlet and outlet of the valve 5 to be tested;

[0041] 7) After the data measured by the measuring device is stable, record the data measured by the measuring device;

[0042] 6) Turn on the laser vibrometer 8, and adjust the position of the laser vibrometer 8 so that the laser emitted by the laser vibrometer 8 passes through the laser test window 14 and irradiates on the laser reflective paper 12;

[0043] The data acquisition system measures the vibration signal of the valve disc 15 in the valve 5 to be tested through the valve disc vibration measuring device, measures the vibration signal of the valve stem 11 through the valve stem vibration sensor 13, measures the lifting force signal of the valve stem 11 through the force sensor 10, and the data acquisition system detects the pressure signal in the unloading chamber through the measuring device 9, and determines whether the valve loading force of the valve 5 to be tested plays a role in suppressing the valve vibration of the valve 5 to be tested according to the vibration information of the valve disc 15 in the valve 5 to be tested, the vibration signal of the valve stem 11, the lifting force signal of the valve stem 11, and the pressure signal in the unloading chamber, thus completing the test and evaluation of the vibration characteristics of the internal components of the valve by non-contact measurement method.

[0044] It should be noted that the sampling frequency of the vibration signal of the valve disc 15, the vibration signal of the valve stem 11, and the lifting force signal should be greater than 5 kHz, and the sampling duration should be greater than 5 s.

Claims

1. A testing and evaluation system for testing the vibration characteristics of valve internal components by non-contact measurement, characterized in that: include: A gas storage tank (3), a cold dryer (4), a laser vibrometer (8), a measuring device (9) for detecting the pressure, temperature and flow rate at the inlet and outlet of the valve to be tested (5) and the pressure on the unloading chamber, and a valve disc vibration measuring device for detecting vibration information of a valve disc (15) in the valve to be tested (5); The outlet of the gas storage tank (3) is connected to the inlet of the valve to be tested (5) through the cold dryer (4); a laser test window (14) is provided on the shell of the valve to be tested (5); a laser reflective paper (12) is pasted on the valve disc (15) in the valve to be tested (5); laser light emitted by the laser vibrometer (8) passes through the laser test window (14) and irradiates the laser reflective paper (12); A force sensor (10) and a valve stem vibration sensor (13) are arranged on the valve stem (11) of the valve to be tested (5); The data acquisition system is connected to the valve disc vibration measuring device, the force sensor (10), the valve stem vibration sensor (13) and the measuring device (9); It also includes a temperature measuring device for measuring the temperature at the inlet and outlet of the valve to be tested (5), and the temperature measuring device records data through a data acquisition system; It also includes a compressor (1) and a purification device (2), wherein the outlet of the compressor (1) is connected to the gas storage tank (3) via the purification device (2); It also includes a first bypass pipe connected to the outlet of the cold dryer (4) and a second bypass pipe connected to the outlet of the compressor (1), wherein a first bypass valve (6) is provided on the first bypass pipe and a second bypass valve (7) is provided on the second bypass pipe.

2. The testing and evaluation system for testing the vibration characteristics of valve internal components by non-contact measurement according to claim 1 is characterized in that: It also includes a flow measurement device for measuring the gas flow at the outlet and the inlet of the valve to be tested (5), and the flow measurement device records data through a data acquisition system.

3. The testing and evaluation system for testing the vibration characteristics of valve internal components by non-contact measurement according to claim 1, characterized in that: Also included is a tripod for supporting the laser vibrometer (8).

4. The testing and evaluation system for testing the vibration characteristics of valve internal components by non-contact measurement according to claim 1, characterized in that: A through hole is provided on the valve housing of the valve to be tested (5), and a transparent glass is installed in the through hole to serve as a laser test window (14), and the transparent glass and the valve housing are bonded and sealed by an adhesive.

5. The testing and evaluation system for testing the vibration characteristics of valve internal components by non-contact measurement according to claim 1, characterized in that: The laser reflective paper (12) is bonded to the valve disc (15).

6. The testing and evaluation system for testing the vibration characteristics of valve internal components by non-contact measurement according to claim 1, characterized in that: The valve stem vibration sensor (13) is an acceleration sensor or a velocity sensor.

7. A method for testing and evaluating the vibration characteristics of valve internal components by non-contact measurement, characterized in that: A testing and evaluation system for testing the vibration characteristics of valve internal components based on the non-contact measurement method of claim 1, comprising the following steps: The air flow outputted from the air storage tank (3) enters the valve to be tested (5), the laser vibrometer (8) is turned on, and the position of the laser vibrometer (8) is adjusted so that the laser light emitted by the laser vibrometer (8) passes through the laser test window (14) and irradiates the laser reflective paper (12); The data acquisition system measures the vibration signal of the valve disc (15) in the valve to be tested (5) through a valve disc vibration measuring device, measures the vibration signal of the valve stem (11) through a valve stem vibration sensor (13), measures the lifting force signal of the valve stem (11) through a force sensor (10), detects the pressure signal of the unloading chamber through a measuring device (9), and determines whether the valve loading force of the valve to be tested (5) plays a role in suppressing the valve vibration of the valve to be tested (5) based on the vibration signal of the valve disc (15) in the valve to be tested (5), the vibration signal of the valve stem (11), the lifting force signal of the valve stem (11) and the pressure signal of the unloading chamber, thereby completing the test of the vibration characteristics of the valve internal components and the vibration evaluation in a non-contact measurement method.

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