Glove box leak detection device and method

Abstract

The invention discloses a glove box leak detection device and method. The glove box leak detection device comprises a gas source used for providing Kr-85 gas, and the gas source is connected with a glove box through a gas inlet pipeline; the mechanical pump is connected with the glove box through an air outlet pipeline; the first detector is used for detecting the Kr-85 gas activity of the internal environment of the glove box; the second detector is used for detecting the radiation intensity of gamma rays on the outer surface of the glove box; and the signal processing equipment is electrically connected with the second detector, and the signal processing equipment is used for processing and analyzing detection information of the second detector and displaying an analysis result. Therefore, leakage detection of the glove box can be realized, the requirements on the structure and the strength of the glove box are low, the original working environment of the glove box does not need to be greatly modified, the operation is simple, the use is convenient, and the detection efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of leakage detection, and in particular to a glove box leakage detection device and method. Background Art

[0002] The glove box is an isolation barrier between the radioactive environment and the normal external environment. Before being put into use, the glove box needs to be leak-tested according to the standard EJT-1096-1999 based on its designed sealing level. However, traditional methods have problems such as long leak detection time and difficulty in quickly locating tiny leaks.

[0003] The current methods for glove box leak detection include:

[0004] (1) Bubble method. This method relies on manually spraying soapy water and observing the bubbles produced to detect leaks. This method is simple and practical and is currently the main leak detection method used, but it is inefficient and takes a long time to find the leak.

[0005] (2) Infrared imaging principle + helium mass spectrometer. The leak detection process is to first irradiate the glove box with a halogen lamp, scan the box and collect data after generating a temperature difference, and finally analyze the data on the computer to locate the leak point. However, the leak detection process of this method is relatively cumbersome and the leak detection efficiency is relatively low; there are dead angles or blind spots in the narrow operating space of the glove box and the parts with high-security pipes, and the data cannot be fully collected and the leak points cannot be found; or there are shortcomings such as inconsistent irradiation intensity leading to low leak detection accuracy; the halogen lamp irradiation link requires a certain space for the installation of the halogen lamp, but there is not enough space in most process plants, especially at the bottom of the glove box and against the wall, where halogen lamps cannot be installed at all.

[0006] (3) Acousto-optic detection method. The principle of leak detection is to convert the weak sound waves generated by the micro-leak in the glove box into light signals, capture the light signals with sensors, and perform demodulation analysis to determine the location of the leak. This method can locate the leak point in real time, has high leak detection efficiency, and a simple leak detection process. However, this method has high requirements for the sensitivity and low noise level of the second detector. Low noise level cannot be guaranteed in most process plants, resulting in a low signal-to-noise ratio and difficulty in distinguishing detection signals.

[0007] (4) Vacuum spraying method + helium mass spectrometer. After sealing a single glove box, evacuate the glove box and connect it to a helium mass spectrometer leak detector. Then, perform helium spray detection on each location of the glove box. If there is a leak at the helium spray location, helium will penetrate into the glove box through the leak under the action of the pressure difference and be detected by the detection device inside the glove box. By detecting whether there is helium in the glove box and the helium concentration in the detection box, it can be known whether there is a leak in the glove box and the leakage rate can be measured. This method requires the glove box to be evacuated to -10000pa. This indicator requires a high structural strength of the glove box and is not applicable to some glove boxes.

[0008] The overall sealing of a glove box is ensured by the tightness of the glove box body and its individual components. To ensure the sealing of the glove box during use, a complete sealing test is required after assembly. Leakage detection, investigation, and rectification are performed until the test passes. Furthermore, traditional methods are difficult to apply due to the interconnected use of multiple glove boxes and the difficulty in adapting already installed glove boxes. Summary of the Invention

[0009] This application aims to solve at least one of the technical problems existing in the related art.

[0010] Therefore, embodiments of the present application provide a glove box leak detection device and method.

[0011] An embodiment of the first aspect of the present application provides a glove box leak detection device, including: a gas source for providing Kr-85 gas, the gas source being connected to the glove box through an air inlet pipe; a mechanical pump, the mechanical pump being connected to the glove box through an air outlet pipe; a first detector for detecting the activity of Kr-85 gas in the internal environment of the glove box; a second detector for detecting the radiation intensity of gamma rays on the outer surface of the glove box; and a signal processing device electrically connected to the second detector, the signal processing device being used to process and analyze detection information of the second detector and display the analysis results.

[0012] Exemplarily, the signal processing device includes: a pulse discriminator for screening and counting valid signals in the detection information; a single-channel analyzer for recording valid signals and outputting a first counting rate of the valid signals; a processor for processing and analyzing the first counting rate and feeding back the analysis results.

[0013] Exemplarily, the energy value of the gamma ray is 0.687 MeV.

[0014] Exemplarily, a first control valve is provided on the air inlet pipeline; and a second control valve is provided on the air outlet pipeline.

[0015] Exemplarily, the first detector is arranged outside the glove box, and the first detector is connected to the air outlet pipe through a connecting pipe, and the connecting pipe is located on a side of the mechanical pump close to the glove box; a third control valve is provided on the connecting pipe.

[0016] Exemplarily, the glove box leak detection device further includes: a recovery gas tank, and an end of the gas outlet pipe away from the glove box is connected to the recovery gas tank.

[0017] An embodiment of the second aspect of the present application provides a glove box leak detection method, which is applied to any of the aforementioned glove box leak detection devices, and the method includes: inputting Kr-85 gas into the glove box, and using a first detector to detect the Kr-85 gas activity in the internal environment of the glove box; based on the detection information of the first detector meeting a first preset requirement, stopping the input of Kr-85 gas into the glove box; using a second detector to detect the radiation intensity of gamma rays on the outer surface of the glove box; a signal processing device processes and analyzes the detection information of the second detector and feeds back the analysis results; observing the analysis results, and determining that the glove box is leaking based on the analysis results meeting a second preset requirement.

[0018] Exemplarily, the analysis results include a first counting rate. After the step of determining that the glove box is leaking, the method further includes: taking the position of the second detector when the first counting rate reaches a second preset requirement as a reference position, moving the second detector near the reference position, and continuing to observe the first counting rate; and determining the position of the glove box corresponding to the second detector when the first counting rate is maximum as the dew point position.

[0019] Exemplarily, the steps of inputting Kr-85 gas into the glove box and detecting the Kr-85 gas activity in the internal environment of the glove box using the first detector include: opening the first control valve, the second control valve, and the third control valve, controlling the operation of the mechanical pump and the first detector, allowing the Kr-85 gas to flow into the glove box through the gas source, and detecting the Kr-85 gas activity in the internal environment of the glove box using the first detector.

[0020] Exemplarily, the step of stopping the input of Kr-85 gas into the glove box based on the detection information of the first detector reaching the first preset requirement includes: based on the second counting rate of the first detector reaching the first preset requirement, controlling the mechanical pump and the first detector to stop working, and closing the first control valve, the second control valve, and the third control valve.

[0021] The glove box leakage detection device and method provided in the embodiments of the present application can realize rapid detection of leakage points in the glove box, and has the following advantages:

[0022] (1) Real-time detection and high detection efficiency. The second detector has a fast response speed and can immediately find the leakage point in the glove box, with small time delay and high detection efficiency.

[0023] (2) Strong anti-interference ability and reliable detection results. This device and method detects leaks by observing the relative count rate changes of the second detector. Due to the shielding effect of the glove box and the ability to set a suitable energy threshold for the pulse discriminator, when there is no leak in the glove box, the background count of gamma rays in the external space is low; when there is a leak in the glove box, the second detector will detect a large amount of Kr-85 gamma ray characteristic energy, and the count rate will change greatly. Therefore, the signal-to-noise ratio of this device and method is much higher than that of traditional methods, and the detection results are reliable. It is not easily affected by environmental factors such as sound, light, and temperature, and has strong anti-interference ability.

[0024] (3) Simple and easy to use, with wide application. This method detects leaks by simply operating the second detector and observing the count rate in the analysis results. It is simple to operate and easy to understand and learn. This method can be used for detection at room temperature and pressure, without requiring major modifications to the original working environment of the glove box. It only requires the connection of Kr-85 gas and the first detector, and the remaining equipment is independent of the original working environment of the glove box. It has low requirements on the structure and strength of the glove box and is widely applicable.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the drawings, the same reference numerals are used to denote the same components.

[0027] Figure 1 One of the structural schematic diagrams of the glove box leak detection device provided in an embodiment of the present application is shown;

[0028] Figure 2 One of the flow charts of the glove box leak detection method provided in an embodiment of the present application is shown;

[0029] Figure 3 The second flow chart of the glove box leak detection method provided in the embodiment of the present application is shown.

[0030] in, Figure 1 The corresponding relationship between the reference numerals and component names is as follows:

[0031] 110 gas source, 120 air inlet pipeline, 121 first control valve, 130 mechanical pump, 140 air outlet pipeline, 141 second control valve, 150 first detector, 160 second detector, 170 signal processing equipment, 171 pulse discriminator, 172 single-channel analyzer, 173 processor, 180 connecting pipeline, 181 third control valve, 200 glove box. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0034] like Figure 1 As shown, an embodiment of the first aspect of the present application provides a glove box leak detection device, including: a gas source 110 for providing Kr-85 gas, the gas source 110 is connected to the glove box 200 through an air inlet pipe 120; a mechanical pump 130, the mechanical pump 130 is connected to the glove box 200 through an air outlet pipe 140; a first detector 150, for detecting the Kr-85 gas activity in the internal environment of the glove box 200; a second detector 160, for detecting the radiation intensity of gamma rays on the outer surface of the glove box 200; a signal processing device 170, electrically connected to the second detector 160, the signal processing device 170 is used to process and analyze the detection information of the second detector 160, and display the analysis results.

[0035] Gas source 110 is used to provide Kr-85 gas, and gas source 110 is connected to glove box 200 via an air intake line 120. Specifically, gas source 110 can be a container storing Kr-85 gas. This facilitates assembly and disassembly of the air intake line 120 and the container, and facilitates the transfer and access of Kr-85 gas. It is understood that the container can be used to store Kr-85 gas for testing and shield the radioactive Kr-85 gas from gamma rays, i.e., γ rays, to prevent radiation damage to personnel and equipment. Specifically, gas source 110 can also be a Kr-85 gas supply pipeline, which can be connected to air intake line 120. Gas source 110 must be able to supply Kr-85 gas at a volume of at least 50 m³ and a gas activity of at least 200 Bq / m³ at normal pressure to ensure detection accuracy.

[0036] Among them, the mechanical pump 130 is connected to the glove box 200 through the outlet pipe 140. When the gas source 110 and the mechanical pump 130 are connected to the glove box 200, the mechanical pump 130 works, which can make the Kr-85 gas in the gas source 110 flow into the glove box 200, and flow out through the glove box 200, and flow through the mechanical pump 130 to the outlet end of the outlet pipe 140.

[0037] The first detector 150 is used to detect the Kr-85 gas activity in the internal environment of the glove box 200, where gas activity refers to the actual concentration of gas molecules or atoms in a mixture. Specifically, the Kr-85 gas activity A in the internal environment of the glove box 200 is proportional to the count rate n1 of the first detector 150, that is, A = k × n1. Here, k is a proportionality coefficient that can be obtained through calibration. By monitoring the count rate n1 of the first detector 150, the Kr-85 gas activity A in the internal environment of the glove box 200 can be obtained. When the Kr-85 gas activity A reaches a first preset requirement, the supply of Kr-85 gas to the glove box 200 can be stopped. For example, the mechanical pump 130 and the various control valves mentioned below can be closed to keep the glove box 200 sealed. Specifically, when using the glove box leak detection device provided in the embodiment of the present application to perform leak detection, the first preset requirement can be 102Bq / m3 to 105Bq / m3, depending on the detection efficiency of the first detector 150 and the input of the Kr-85 gas source 110.

[0038] The second detector 160 is used to detect the intensity of gamma ray radiation on the outer surface of the glove box 200. Specifically, the energy of gamma rays from Kr-85 gas is 0.687 MeV. The absorption rate of 0.687 MeV gamma rays from Kr-85 gas is approximately 93.3% within 5 cm of cast iron. The glove box 200 is made of non-cast iron, and the wall thickness is approximately 5 cm. It is understood that a higher absorption rate results in a greater difference in gamma ray radiation levels between the inside and outside of the glove box 200. If a leak exists in the glove box 200, the gamma ray radiation around the leak will increase significantly when the second detector 160 passes by it. This means that the gamma ray radiation intensity of the Kr-85 gas that directly contacts the second detector 160 is much greater than the gamma ray radiation intensity of the Kr-85 gas that is isolated by the glove box 200 wall.

[0039] Among them, the signal processing device 170 is used to process and analyze the detection information of the second detector 160, thereby being able to process and analyze the gamma ray radiation intensity detected by the second detector 160 to obtain the gamma ray radiation count rate, wherein the gamma ray radiation count rate in the Kr-85 gas directly contacting the second detector 160 is significantly increased compared to the count rate when there is no leakage, thereby being able to realize the function of detecting tiny leaks and determine the location of the leaks.

[0040] That is to say, in the glove box leak detection device provided in the embodiment of the present application, when the gas source 110 and the mechanical pump 130 are both connected to the glove box 200, the mechanical pump 130 works, so that the Kr-85 gas in the gas source 110 can flow into the glove box 200, and the first detector 150 is used to detect the Kr-85 gas activity in the internal environment of the glove box 200. When the Kr-85 gas activity in the internal environment of the glove box 200 reaches a first preset requirement, the supply of Kr-85 gas into the glove box 200 can be stopped. Then, the second detector 160 is used to detect the radiation intensity of gamma rays on the outer surface of the glove box 200. Since the wall of the glove box 200 has a high absorption rate for the 0.687MeV gamma rays of Kr-85 gas, the gamma ray radiation intensity around the leak point is much greater than the gamma ray radiation intensity in the Kr-85 gas isolated by the wall of the glove box 200. The signal processing device 170 is used to process and analyze the detection information of the second detector 160. Based on whether the gamma ray radiation count rate in the analysis results is significantly improved, the detection of tiny leaks can be achieved and the location of the leak can be determined.

[0041] The glove box leak detection device provided in the embodiment of the present application can detect leaks in the glove box 200 in real time, and the second detector 160 has a fast response speed and can immediately detect the presence of a leak, with a small time delay and high detection efficiency. At the same time, it is only necessary to simply operate the second detector 160 and observe the analysis results displayed by the signal processing device 170 to determine whether the glove box 200 is leaking. The operation is simple, easy to understand and learn, simple and easy to use, and has a wide range of uses. In addition, the glove box 200 leakage detection device provided in the embodiment of the present application can be used for detection at room temperature and pressure, without the need for major modifications to the original working environment of the glove box 200. It only needs to be connected to Kr-85 gas and the first detector 150, and the remaining equipment is independent of the working environment. It has low requirements on the structure and strength of the glove box 200, has a wide range of uses, and is suitable for promotion and application.

[0042] The second detector 160 can be a scintillator detector, a gas detector, or a semiconductor detector. Considering cost reduction and working environment requirements, a scintillator detector is preferred. If a scintillator detector is selected, a photoelectric conversion device (such as a photomultiplier tube) must be added to the signal processing device 170.

[0043] like Figure 1 As shown, in some possible embodiments provided in the present application, a first control valve 121 is provided on the air intake line 120 to control the connection state between the air source 110 and the glove box 200 through the first control valve 121. When the first control valve 121 is opened, the air source 110 and the glove box 200 are connected through the air intake line 120. When the first control valve 121 is closed, the air source 110 and the glove box 200 are isolated.

[0044] Among them, Figure 1 As shown, a second control valve 141 is provided on the air outlet pipe 140 to control the connection state between the mechanical pump 130 and the glove box 200 through the second control valve 141. When the second control valve 141 is opened, the mechanical pump 130 and the glove box 200 are connected through the air intake pipe 120. When the second control valve 141 is closed, the mechanical pump 130 and the glove box 200 are isolated.

[0045] like Figure 1 As shown, in some possible embodiments provided in the present application, the first detector 150 is arranged outside the glove box 200, and the first detector 150 is connected to the gas outlet pipe 140 through the connecting pipe 180. The connecting pipe 180 is located on the side of the mechanical pump 130 close to the glove box 200. Therefore, when the mechanical pump 130 is connected to the glove box 200, the gas state in the glove box 200 is the same as the gas state on the gas outlet pipe 140. By detecting the Kr-85 gas activity in the gas outlet pipe 140 by the first detector 150 outside the glove box 200, the Kr-85 gas activity in the internal environment of the glove box 200 can be detected. This setting method simplifies the operation of setting the first detector 150 inside the glove box 200. By connecting the air outlet pipe 140 to the glove box 200, the connection between the mechanical pump 130 and the glove box 200 and the connection between the first detector 150 and the glove box 200 can be achieved. It is easy to operate and simple, and there is no need to make major modifications to the original working environment of the glove box 200. It has a wide range of uses.

[0046] Furthermore, a third control valve 181 is provided on the connecting pipe 180 to control the connection state between the first detector 150 and the air outlet pipe 140 through the third control valve 181. When the third control valve 181 is opened, the first detector 150 is connected to the air outlet pipe 140 through the connecting pipe 180. When the third control valve 181 is closed, the first detector 150 and the air outlet pipe 140 are isolated.

[0047] like Figure 1 As shown, in some possible embodiments provided in the present application, the signal processing device 170 includes: a pulse discriminator 171, used to filter the detection information to obtain a valid signal; a single-channel analyzer 172, used to record the valid signal and output the first counting rate of the valid signal; a processor 173, used to process and analyze the first counting rate and feedback the analysis results.

[0048] The pulse discriminator 171 is used to filter ambient background radiation and select and count valid signals from the detection information. Specifically, by setting an appropriate energy threshold for the pulse discriminator 171, only rays with radiation energies within the energy threshold range are counted. In other words, only rays with valid signals are counted. The radiation energy of valid signals falls within the threshold range, which is set above and below the characteristic peak of Kr-85's 0.687 MeV gamma rays.

[0049] The single-channel analyzer 172 is used to record the effective signal detected by the second detector 160 and output a first count rate of the effective signal. It is understandable that the single-channel analyzer 172 can also output count information of the effective signal.

[0050] The processor 173 is configured to process and analyze the first count rate of the valid signal in the detection information and to provide feedback of the analysis results, i.e., to the user, so that the user can determine whether the glove box 200 is leaking based on the analysis results provided by the processor 173. Specifically, the analysis result feedback module in the processor 173 can be flexibly configured, such as by configuring a display to display the first count rate, or configuring a prompt to indicate an abnormality in the first count rate, thereby indicating a leak.

[0051] In some possible embodiments provided in the present application, the glove box leak detection device also includes: a recovery gas tank, and the end of the gas outlet pipe 140 away from the glove box 200 is connected to the recovery gas tank, that is, the gas outlet end of the gas outlet pipe 140 can be connected to the recovery gas tank. The setting of the recovery gas tank can recycle the gas after detection. It can be understood that the recovery gas tank can be used to store the Kr-85 gas after detection and shield the gamma rays of the radioactive Kr-85 gas to avoid radiation damage to personnel and equipment.

[0052] like Figure 2 As shown, the present application also provides a glove box leak detection method, which is applied to any of the above-mentioned glove box leak detection devices, and the method comprises:

[0053] Step S210: inputting Kr-85 gas into the glove box, and detecting the Kr-85 gas activity in the internal environment of the glove box using a first detector;

[0054] Step S220: Stopping the input of Kr-85 gas into the glove box based on the detection information of the first detector meeting the first preset requirement;

[0055] Step S230: Detecting the radiation intensity of gamma rays on the outer surface of the glove box using a second detector;

[0056] Step S240: The signal processing device processes and analyzes the detection information of the second detector and feeds back the analysis result;

[0057] Step S250: Observe the analysis result, and determine that the glove box is leaking based on the analysis result meeting the second preset requirement.

[0058] The glove box leak detection method provided in the present embodiment introduces Kr-85 gas into the glove box 200 and uses a first detector 150 to detect the Kr-85 gas activity within the glove box 200. When the detection information from the first detector 150 reaches a first preset requirement, the introduction of Kr-85 gas into the glove box 200 is stopped. Since 5 cm of cast iron has an absorption rate of approximately 93.3% for 0.687 MeV gamma rays emitted by Kr-85 gas, and the glove box 200 wall is approximately 5 cm thick, the absorption rate is higher, resulting in a greater difference in gamma ray radiation levels inside and outside the glove box 200. Therefore, the second detector 160 is used to detect the radiation intensity of the gamma rays on the outer surface of the glove box 200, and the signal processing device 170 is used to process and analyze the detection information of the second detector 160, so that only the rays of valid signals can be counted, such as the signals of rays with radiation energy above and below the characteristic peak of the 0.687MeV gamma rays of Kr-85 can be counted, and the valid signals are analyzed and processed, and the analysis results are fed back, and the user observes the analysis results. When the analysis results meet the second preset requirements, such as the first counting rate of the valid signal in the analysis results meets the second preset requirements, it means that the 0.687MeV gamma rays of Kr-85 gas pass through the glove box 200 and radiate to the second detector 160, it can be determined that the glove box 200 is leaking, so as to achieve leakage detection of the glove box 200.

[0059] It is understandable that when the analysis result does not meet the second preset requirement, the second detector 160 can continue to be used to detect the radiation intensity of gamma rays on the outer surface of the glove box 200, such as moving the second detector 160 to different positions of the glove box 200 for detection until the analysis result meets the second preset requirement, indicating that the glove box 200 is leaking. If the second detector 160 scans the entire outside of the glove box 200 and the analysis results do not meet the second preset requirement, it means that the glove box 200 is leaking.

[0060] In some possible embodiments provided herein, the analysis result includes a first count rate. After determining whether the glove box 200 is leaking, the method further includes:

[0061] Taking the position of the second detector when the first counting rate reaches a second preset requirement as a reference position, moving the second detector near the reference position and continuing to observe the first counting rate;

[0062] The position of the glove box corresponding to the second detector when the first counting rate is maximum is determined as the dew point position.

[0063] In this embodiment, the analysis results include a first count rate, which can be understood as the count rate of valid signals in the detection information from second detector 160. When the first count rate reaches a second preset requirement, it indicates that 0.687 MeV gamma rays from the Kr-85 gas in glove box 200 have passed through glove box 200 and radiated to second detector 160, indicating a leak in glove box 200, likely located nearby. Therefore, using the position of second detector 160 in this state as a reference position, second detector 160 is moved near the reference position and the first count rate is continuously observed. As second detector 160 moves relative to the reference position, the value of the first count rate changes. When the first count rate reaches a maximum value, it indicates that 0.687 MeV gamma rays from the Kr-85 gas in glove box 200 have passed through the leak point at that location in glove box 200 and radiated to second detector 160. Therefore, the position of glove box 200 corresponding to the maximum first count rate is determined to be the dew point, thereby determining the leak point.

[0064] In some possible implementation embodiments provided in this application, step S210 includes the following methods and steps.

[0065] Open the first control valve, the second control valve, and the third control valve to control the operation of the mechanical pump and the first detector. Kr-85 gas flows into the glove box through the gas source, and the first detector is used to detect the Kr-85 gas activity in the internal environment of the glove box.

[0066] In this embodiment, by opening the first control valve 121, the second control valve 141, and the third control valve 181, the gas source 110 is connected to the glove box 200 through the air inlet pipe 120, the mechanical pump 130 is connected to the glove box 200 through the air outlet pipe 140, and the first detector 150 is connected to the glove box 200 through the connecting pipe and the air outlet pipe 140. Then, the mechanical pump 130 and the first detector 150 are controlled to work, so that Kr-85 gas can flow into the glove box 200 through the gas source 110, and the first detector 150 can detect the Kr-85 gas activity in the internal environment of the glove box 200.

[0067] In some possible implementation embodiments provided in this application, step S220 includes the following methods and steps.

[0068] Based on the second counting rate of the first detector reaching the first preset requirement, the mechanical pump and the first detector are controlled to stop working, and the first control valve, the second control valve, and the third control valve are closed.

[0069] In this embodiment, when the second counting rate of the first detector 150 reaches the first preset requirement, it indicates that the Kr-85 gas activity in the internal environment of the glove box 200 reaches the preset requirement. At this time, the mechanical pump 130 and the first detector 150 are controlled to stop working, and the first control valve 121, the second control valve 141, and the third control valve 181 are closed, so that the glove box 200 remains sealed to facilitate leak detection and provide the accuracy of leak detection.

[0070] Specifically, refer to Figure 3 The process steps of performing leakage detection using the leakage detection device for the glove box 200 provided in the embodiment of the present application are described as follows:

[0071] (1) Open the valves and ventilate. For example, open the first control valve 121, the second control valve 141, and the third control valve 181 to release the sealed state of the internal environment of the glove box 200, allowing the test gas to enter and connect to the first detector 150, and the internal gas of the glove box 200 to flow out.

[0072] (2) Inflate until the Kr-85 concentration reaches a preset value. Specifically, the mechanical pump 130 and the first detector 150 are turned on, so that the Kr-85 detection gas enters the internal environment of the glove box 200 and the first detector 150 through the gas source 110. The first detector 150 operates so as to detect the Kr-85 gas activity level in the internal environment of the glove box 200 and adjust the internal environment of the glove box 200 to meet the detection requirements. For example, when the Kr-85 gas activity in the internal environment of the glove box 200 reaches the first preset requirement, it indicates that the glove box has been inflated until the Kr-85 concentration reaches the preset value, thus meeting the detection requirements.

[0073] (3) Stop ventilation and close valves. Specifically, turn off the mechanical pump 130, close the first control valve 121, the second control valve 141, and the third control valve 181 to create a sealed condition for the glove box 200 and maintain the internal environment required for testing.

[0074] (4) Use the probe to scan the periphery of the glove box. Specifically, use the second probe 160 to scan the periphery of the glove box 200. Maintaining a distance between the outer wall of the glove box 200 and the second probe 160, use the second probe 160 to aim at the glove box 200 and pass over the outer surface of the glove box 200. The nearby radiation will deposit energy on the probe and convert it into light / electrical signals.

[0075] (5) Observe the relative count rate level of a single channel. The relative count rate level can be understood as the change in the count rate. Specifically, observe the change in the count rate of the feedback single-channel analyzer 172. After the detection information of the second detector 160 passes through the pulse discriminator 171, the count rate of the single-channel analyzer 172 is proportional to the Kr-85 gas activity near the second detector 160. If the count rate of the single-channel analyzer 172 is higher, it means that the Kr-85 gas activity near the second detector 160 is greater. Under the condition that there is no other Kr-85 gas source in the external environment, it means that the leakage rate of the glove box 200 is higher. If there is no leakage in the glove box 200, the count rate level of the single-channel analyzer 172 is maintained at a low value.

[0076] (6) When the count rate level of the single-channel analyzer 172 is observed to be normal, it indicates that there is no leakage in the glove box 200, and the second detector can continue to be used to scan and detect foreign objects in the glove box.

[0077] (7) Discovering a leak: When the count rate level of the single-channel analyzer 172 is observed to be abnormally high, it can be determined that there is a leak in the glove box 200 around the second detector 160, that is, a leak is discovered in the glove box 200.

[0078] (8) Scan to find the point with the highest relative count rate. Specifically, move the second detector 160 near the discovered leak point to find the location where the highest count rate occurs. The position of the glove box 200 corresponding to the second detector 160 when the count rate is the highest is determined to be the leak point, thereby locating the leak point.

[0079] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A glove box leak detection device, characterized in that: include: A gas source, for providing Kr-85 gas, wherein the gas source is connected to the glove box via an air inlet pipeline; a mechanical pump connected to the glove box via an air outlet pipe; A first detector is used to detect the Kr-85 gas activity in the internal environment of the glove box; a second detector, configured to detect the radiation intensity of gamma rays on the outer surface of the glove box; A signal processing device is electrically connected to the second detector, and is used to process and analyze the detection information of the second detector and display the analysis result.

2. The glove box leak detection device according to claim 1, characterized in that: The signal processing device comprises: A pulse discriminator, configured to screen and count valid signals in the detection information; a single-channel analyzer, configured to record the valid signal and output a first count rate of the valid signal; The processor is configured to process and analyze the first counting rate and feed back the analysis result.

3. The glove box leak detection device according to claim 1, characterized in that: The energy value of the gamma ray is 0.687 MeV.

4. The glove box leak detection device according to claim 1, characterized in that: A first control valve is provided on the air intake pipe; A second control valve is provided on the air outlet pipeline.

5. The glove box leak detection device according to claim 1, characterized in that: The first detector is arranged outside the glove box and is connected to the air outlet pipeline through a connecting pipeline. The connecting pipeline is located on a side of the mechanical pump close to the glove box; a third control valve is provided on the connecting pipeline.

6. The glove box leak detection device according to claim 1, characterized in that: Also includes: A recovery gas tank is connected to the recovery gas tank at an end of the gas outlet pipe away from the glove box.

7. A glove box leak detection method, characterized in that: Applied to the glove box leak detection device according to any one of claims 1 to 6, the method comprises: Inputting Kr-85 gas into the glove box and detecting the Kr-85 gas activity in the internal environment of the glove box using a first detector; stopping the supply of the Kr-85 gas to the glove box based on the detection information of the first detector meeting a first preset requirement; detecting the radiation intensity of gamma rays on the outer surface of the glove box using a second detector; The signal processing device processes and analyzes the detection information of the second detector and feeds back the analysis result; The analysis result is observed, and based on the analysis result meeting a second preset requirement, it is determined that the glove box is leaking.

8. The glove box leak detection method according to claim 7, characterized in that: The analysis result includes a first count rate. After determining the leakage of the glove box, the method further includes: Taking the position of the second detector when the first count rate reaches the second preset requirement as a reference position, moving the second detector near the reference position and continuing to observe the first count rate; The position of the glove box corresponding to the second detector when the first counting rate is maximum is determined as the dew point position.

9. The glove box leak detection method according to claim 7, characterized in that: The step of inputting Kr-85 gas into the glove box and detecting the Kr-85 gas activity in the internal environment of the glove box using a first detector comprises: The first control valve, the second control valve, and the third control valve are opened to control the operation of the mechanical pump and the first detector. The Kr-85 gas flows into the glove box through the gas source, and the first detector is used to detect the Kr-85 gas activity in the internal environment of the glove box.

10. The glove box leak detection method according to claim 7, characterized in that: The step of stopping the input of the Kr-85 gas into the glove box based on the detection information of the first detector meeting a first preset requirement includes: Based on the second count rate of the first detector reaching the first preset requirement, the mechanical pump and the first detector are controlled to stop working, and the first control valve, the second control valve, and the third control valve are closed.

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