Infrared nondestructive testing device and method for defect detection of high heat load components

Abstract

The present invention belongs to detection devices and methods, and specifically relates to an infrared nondestructive detection device and method for defect detection of high heat load components. An infrared nondestructive detection device for defect detection of high heat load components includes a cold water detection circulation system and a hot water detection circulation system, wherein the outlet of the cold water detection circulation system is connected to the outlet of the hot water detection circulation system, and the mixed detection water flows through a plurality of parallel arranged samples to be tested, and the water flowing through the samples to be tested flows back to the cold water detection circulation system and the hot water detection circulation system for circulation. The significant effect of the present invention is that the system is divided into two parts: outdoor equipment and indoor equipment. The liquid cooling source and the heating source are outdoor equipment, and the variable frequency flow control system, the experimental operation table, the electrical control cabinet and the data acquisition and processing system are indoor equipment. The separation of the two parts can effectively reduce the interference of the environment in which the equipment is located on the samples to be tested during the detection process, and improve reliability.

Description

Technical Field

[0001] The invention belongs to a detection device and a method, and in particular relates to an infrared nondestructive detection device and a method for defect detection of high heat load components. Background Art

[0002] The processing and manufacturing of plasma-oriented components and their performance evaluation are one of the most critical technologies for the realization of future nuclear fusion reactors. Nondestructive testing technology is an important defect characterization method in the processing and manufacturing of high heat load components and performance evaluation. Nondestructive testing technology uses the changes in thermal, acoustic, optical, electrical and magnetic reactions caused by structural anomalies or defects inside materials or components for detection. Among them, infrared nondestructive testing is a nondestructive testing method with low cost, rapid detection, little influence by size, and no need for special detection media for samples. It can be divided into two forms: external excitation and internal excitation according to different excitation methods. External excitation methods mainly use flash lamps, lasers, electromagnetics and ultrasound, but their detection depth is limited to a certain extent.

[0003] The high heat load components of nuclear fusion reactors are composed of armor materials (such as low atomic number graphite, CFC and high atomic number tungsten) welding the side facing the plasma to heat sink materials such as copper alloy (such as CuZrCr) or low activation steel. The armor material needs to have a certain thickness. For example, low atomic number graphite and CFC require a thickness of about 8mm, and high atomic number tungsten also requires 5mm. Therefore, external excitation infrared nondestructive testing with limited detection depth is not suitable for the detection of such welded components.

[0004] Moreover, the high heat load components of nuclear fusion reactors will be cooled by cooling pipes in the heat sink material with water or helium as the cooling medium during service. Therefore, the corresponding non-destructive testing also needs to match the specific environment in which it is in service, so as to provide reliable defect detection means for such high heat load components. Summary of the invention

[0005] The present invention aims to overcome the defects of the prior art and provides an infrared nondestructive testing device for defect detection of high heat load components.

[0006] The present invention is implemented as follows: an infrared nondestructive testing device for defect detection of high heat load components includes a cold water detection circulation system and a hot water detection circulation system, wherein the water outlet of the cold water detection circulation system is connected to the water outlet of the hot water detection circulation system, and the mixed detection water flows through a plurality of parallel arranged samples to be tested, and the water flowing through the samples to be tested flows back to the cold water detection circulation system and the hot water detection circulation system for recycling.

[0007] As described above, an infrared nondestructive testing device for defect detection of high heat load components, wherein the cold water detection circulation system includes a liquid cooling source, which is used to collect and store circulating cold water, the liquid cooling source is connected to a variable frequency water pump through a pipeline, the variable frequency water pump is electrically connected to a cold water variable frequency flow controller and is controlled by the cold water variable frequency flow controller, the variable frequency water pump is connected to a cold water manifold through a pipeline, and several outlets of the cold water manifold are respectively connected to samples to be tested through pipelines, a pressure sensor is arranged on the pipeline connecting the variable frequency water pump and the cold water manifold, the signal measured by the pressure sensor is transmitted to a PLC controller, the PLC controller processes the signal and sends it to a display screen and a cold water variable frequency flow controller for display, and the PLC controller is also connected to an alarm for alarming when the signal exceeds a threshold.

[0008] As described above, an infrared nondestructive testing device for defect detection of high heat load components, wherein the hot water detection circulation system includes a heating source, which is used to collect, store and heat circulating water. The heating source is connected to a variable frequency water pump through a pipeline, and the variable frequency water pump is electrically connected to a hot water variable frequency flow controller and is controlled by the hot water variable frequency flow controller. The variable frequency water pump is connected to a hot water water distributor through a pipeline, and several outlets of the hot water water distributor are respectively connected to samples to be tested through pipelines. A pressure sensor is arranged on the pipeline connecting the variable frequency water pump and the hot water water distributor, and the signal measured by the pressure sensor is transmitted to a PLC controller, which processes the signal and sends it to a display screen and a cold water variable frequency flow controller for display, respectively. The PLC controller is also connected to an alarm for alarming when the signal exceeds a threshold.

[0009] In the infrared nondestructive testing device for defect detection of high heat load components as described above, water at the outlet of the cold water distributor and water at the outlet of the hot water distributor are mixed.

[0010] In the infrared nondestructive testing device for defect detection of high heat load components as described above, at most four samples to be tested are provided at the same time.

[0011] As described above, an infrared nondestructive testing device for defect detection of high heat load components includes a laboratory operating table, a plurality of slots are arranged on the top surface of the laboratory operating table, and the slots are sample fixing slots. A vertical frame is arranged on the laboratory operating table, and vertically arranged X-axis slides, Y-axis slides and Z-axis slides are arranged on the frame. All X-axis slides, Y-axis slides and Z-axis slides are controlled by displacement drive motors.

[0012] An infrared nondestructive testing method for defect detection of high heat load components comprises the following steps:

[0013] Step 1: Prepare the module to be tested, and process it through sandpaper polishing, flannel polishing, cold air drying and other processes to ensure that the CFC surface of the module has a uniform infrared emission coefficient.

[0014] Step 2: Fix the processed module to be tested into the sample fixing slot of the experimental operation table, and then use the Swagelok VCR connector to connect the module to be tested with the cold and hot water supply pipes of the infrared nondestructive testing device.

[0015] Step 3: Turn on the control computer of the infrared nondestructive testing device, turn on the infrared nondestructive thermal imager, adjust the position of the module to be tested in the card slot of the experimental operation table, and adjust the position of the high-speed infrared camera on the fixed seat.

[0016] Step 4: Set the temperature of the liquid cooling source and the heating source to 2-5°C and 93-97°C respectively, and wait for them to reach the set temperature.

[0017] Step 5: Adjust the cold water and hot water flow rates to 100L / min and 50L / min respectively, open the hot water supply control valve and wait for the sample surface temperature to reach thermal equilibrium, then quickly switch the medium in the channel to cold water through the fast solenoid valve. During the whole process, the infrared thermal imager records the infrared thermal image of the sample surface.

[0018] Step 6: After the infrared thermal imager obtains the infrared thermal image of the sample to be tested during the cooling process, it is imported into the post-processing software for numerical processing, and then the size and morphological characteristics of the welding interface defects of the sample to be tested are obtained.

[0019] Step 7. Close the cold water supply control valve, turn off the liquid cooling source and heating source, turn off the infrared thermal imager, turn on the air source switch to blow air into the water supply pipe of the tested sample to remove the water remaining in the pipe of the tested sample, turn off the infrared nondestructive testing device control computer, remove the sample to be tested and keep it properly.

[0020] The significant effect of the present invention is that the system is divided into two parts: outdoor equipment and indoor equipment. The liquid cooling source and the heating source are outdoor equipment, and the variable frequency flow control system, the experimental operating table, the electrical control cabinet and the data acquisition and processing system are indoor equipment. The separation of the two parts can effectively reduce the interference of the environment in which the equipment is located on the sample to be tested during the detection process, and improve reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the principle of the infrared nondestructive testing device.

[0022] Figure 2 This is a schematic diagram of the principle of variable frequency flow control system.

[0023] Figure 3 Schematic diagram of the experimental operating table.

[0024] Among them, 1-liquid cooling source, 2-heating source, 3-cold water variable frequency flow controller, 4-hot water variable frequency flow controller, 5-cold water distributor, 6-hot water distributor, 7-water collector, 8, 9, 10 and 11 are samples to be tested, 12-cold water distributor pipe, 13-hot water distributor pipe, 14-variable frequency water pump, 15-pressure sensor, 16-display screen, 17-PLC controller, 18-alarm, 19-sample fixing slot, 20-experimental operating table, 21-X-axis slide, 22-Y-axis slide, 23-Z-axis slide, 24-displacement drive motor. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation of the present invention is described in detail below with reference to the accompanying drawings. Those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0026] Example 1: Infrared nondestructive testing of welding defects of flat-plate CFC / Cu high heat load modules. The module to be tested in this example is welded by a special brazing process and needs to withstand 7MW / m 2 During the preparation process, each module needs to be non-destructively tested, and CFC should be prevented from contacting water, grease and other substances that may affect the vacuum degree of the device. The inspection task is large, and a non-destructive inspection method with strong operability, high detection rate and fast inspection speed is required.

[0027] An active internal excitation source infrared nondestructive testing device is used for rapid detection of welding defects of high heat load welding components of fusion reactors during the preparation process and after high heat load experiments. The device comprises six parts: a liquid cooling source, a heating source, a variable frequency flow control system, an experimental operation table, an electrical control cabinet, and a data acquisition and processing system. The liquid cooling source and heating source systems use closed-loop control to achieve constant temperature and stable water supply. The variable frequency flow control system achieves flow control of cold water and hot water, and achieves rapid switching of cold water and hot water through a fast solenoid valve. The experimental operation table is used to fix the test product and is equipped with a three-degree-of-freedom infrared camera fixing seat. The electrical control cabinet automatically controls the operation of the device. The data acquisition and processing system is used to collect and process data.

[0028] The liquid cooling source and heating source adopt closed-loop control to achieve constant temperature water control. The temperature range of cold water provided by the liquid cooling source is 2-5°C, and the temperature range of hot water provided by the heating source is 93-97°C. The water pump of the variable frequency flow control system adopts variable frequency control, and the water supply pressure is adjustable. The cold water flow and hot water flow can reach 130L / min and 80L / min respectively. The equipped solenoid valve is a fast solenoid valve, and its response time is less than 1s, which can realize fast switching between hot water and cold water.

[0029] The experimental operating table is equipped with a fixing slot for the test sample, and the slot direction is divided into two directions, X and Y, which can effectively fix the sample; the experimental operating table is equipped with a three-degree-of-freedom infrared non-destructive camera fixing seat, which can realize the movement of X, Y and Z axes.

[0030] The data acquisition system and processing system collect the sensor values ​​such as temperature, pressure and flow in real time through the collector; the data processing system can process the data collected by the infrared thermal imager in real time and give the size and morphological characteristics of the defects in the form of images.

[0031] All parts in contact with water and workpieces are made of water-resistant materials such as stainless steel, aluminum alloy or brass.

[0032] Step 1: Prepare the module to be tested, and process the module to be tested by sandpaper grinding, flannel polishing, cold air drying and other processes to ensure that the CFC surface of the module has a uniform infrared emission coefficient.

[0033] Step 2: Fix the processed module to be tested into the sample fixing slot of the experimental operation table, and then use Swagelok VCR connector to connect the module to be tested with the cold and hot water supply pipes of the infrared nondestructive testing device.

[0034] Step 3: Turn on the control computer of the infrared nondestructive testing device, turn on the infrared nondestructive thermal imager, adjust the position of the module to be tested in the card slot of the experimental operating table, and adjust the position of the high-speed infrared camera on the fixed seat.

[0035] Step 4: Set the temperatures of the liquid cooling source and the heating source to 2-5°C and 93-97°C respectively, and wait for them to reach the set temperatures.

[0036] Step 5. Adjust the cold water and hot water flow rates to 100 L / min and 50 L / min respectively, open the hot water supply control valve and wait for the surface temperature of the sample to reach thermal equilibrium, then quickly switch the medium in the channel to cold water through the fast solenoid valve. During the whole process, the infrared thermal imager records the infrared thermal image of the sample surface.

[0037] Step 6: After the infrared thermal imager obtains the infrared thermal image of the sample to be tested during the cooling process, it is imported into the post-processing software for numerical processing, and then the size and morphological characteristics of the welding interface defects of the sample to be tested are obtained.

[0038] Step 7. Close the cold water supply control valve, turn off the liquid cooling source and heating source, turn off the infrared thermal imager, turn on the air source switch to blow air into the water supply pipe of the tested sample to remove the water remaining in the pipe of the tested sample, turn off the infrared nondestructive testing device control computer, remove the sample to be tested and keep it properly.

Claims

1. An infrared nondestructive testing method for defect detection of high heat load components, characterized in that: The following steps are included Step 1: Prepare the module to be tested, and process it through sandpaper grinding, flannel polishing, and cold air drying to ensure that the CFC surface of the module has a uniform infrared emission coefficient. Step 2: Fix the processed module to be tested into the sample fixing slot of the experimental operation table, and then use the Swagelok VCR connector to connect the module to be tested with the cold and hot water supply pipes of the infrared nondestructive testing device. Step 3: Turn on the control computer of the infrared nondestructive testing device, turn on the infrared nondestructive thermal imager, adjust the position of the module to be tested in the card slot of the experimental operation table, and adjust the position of the high-speed infrared camera on the fixed seat. Step 4: Set the temperature of the liquid cooling source and the heating source to 2-5°C and 93-97°C respectively, and wait for them to reach the set temperature. Step 5: Adjust the cold water and hot water flow rates to 100L / min and 50L / min respectively, open the hot water supply control valve and wait for the sample surface temperature to reach thermal equilibrium, then quickly switch the medium in the channel to cold water through the fast solenoid valve. During the whole process, the infrared thermal imager records the infrared thermal image of the sample surface. Step 6: After the infrared thermal imager obtains the infrared thermal image of the sample to be tested during the cooling process, it is imported into the post-processing software for numerical processing, and then the size and morphological characteristics of the welding interface defects of the sample to be tested are obtained. Step 7. Close the cold water supply control valve, turn off the liquid cooling source and heating source, turn off the infrared thermal imager, turn on the air source switch to blow air into the water supply pipe of the tested sample to remove the water remaining in the pipe of the tested sample, turn off the infrared nondestructive testing device control computer, remove the sample to be tested and keep it properly.

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