Leakage rate detection system and leakage rate detection method for gas-liquid two-phase working medium

Abstract

The invention relates to the technical field of spacecraft leakage detection, in particular to a leakage rate detection system and method for a gas-liquid two-phase working medium, the leakage rate detection system comprises a vacuum container, a gas sensor and a control device, the gas sensor is arranged in the vacuum container, and the control device is arranged in the vacuum container. The gas sensor comprises a gas sensitive element used for adsorbing leakage gas of the product to be detected and changing the resistance value of the gas sensor and a detection element used for collecting the value of current passing through the gas sensor; and the control device calculates the leakage rate of the leaked gas of the to-be-detected product. According to the leak rate detection system, the gas sensor adsorbs the leaked gas of the to-be-detected product, and the leak rate of the leaked gas of the to-be-detected product is calculated, so that the leak rate detection method is simplified, the defects of precision and sensitivity of actual work quality leakage detection are overcome, accurate quantitative analysis is realized, the cost of a spacecraft development stage is reduced, and the detection efficiency is improved. And the efficiency and the reliability of gas-liquid two-phase work quality leakage detection are improved.

Description

Technical Field

[0001] The present application relates to the technical field of spacecraft leakage detection, and in particular to a leakage rate detection system and a leakage rate detection method for gas-liquid two-phase working fluids. Background Art

[0002] The development process of aerospace products involves a large number of components, parts and complete products with sealing performance requirements, such as heat pipes of thermal control systems, tanks for propellant fuel and sealed cabins of manned spacecraft. As one of the most important technical indicators in the reliability of spacecraft structures, the sealing performance of aerospace products is directly related to the launch success rate and on-orbit service life of spacecraft. Therefore, in order to ensure the high reliability of spacecraft, leak detection runs through the entire life cycle of aerospace products from design, single-machine manufacturing, assembly, whole-machine delivery, launch to operation. It is an important means to ensure the sealing performance of aerospace products.

[0003] For some stand-alone products of spacecraft, such as cold plates, phase change plates and heat pipes of thermal control systems, ammonia, difluorochloromethane, perfluorotriethylamine and other heat transfer fluids are generally encapsulated inside, and the sealing performance is high, and leak detection of the actual fluid is required. At present, quadrupole mass spectrometry leak detection, test paper method or weighing method are usually used for leak detection, but the quadrupole mass spectrometry leak detection method is complicated, and there are many factors affecting the test accuracy and reliability, and it is difficult to quantify on-site calibration; the weighing method has large detection errors, low positioning accuracy, and is greatly affected by environmental factors; the test paper method cannot be quantified and other problems.

[0004] In view of this, this application is specially filed. Summary of the invention

[0005] The present application provides a leak rate detection system for a gas-liquid two-phase working fluid, which is used to solve the problem of how to improve the sensitivity and positioning accuracy of the leak rate detection system, simplify the leak rate detection method of the leak rate detection system, and reduce the error of the leak rate detection system.

[0006] On the one hand, the present application provides a leakage rate detection system for gas-liquid two-phase working fluid, comprising: A vacuum container for containing the product to be tested; A gas sensor is arranged in the vacuum container, the gas sensor comprising a gas sensitive element for absorbing the leaked gas of the product to be tested and changing the resistance value of the gas sensor and a detection element for collecting the current value passing through the gas sensor; The control device is used to calculate the leakage rate of the gas leaked by the product to be tested based on the collected current value passing through the gas sensor.

[0007] In some embodiments, the gas sensor also includes a data processing element for obtaining a gas concentration value in the vacuum container based on a collected current value passing through the gas sensor, and the control device is further used to calculate a leakage rate of the gas leakage of the product to be tested based on the obtained gas concentration value in the vacuum container.

[0008] In some embodiments, the gas sensing element comprises: A two-dimensional phase change material substrate, wherein the surface of the two-dimensional phase change material has slits formed by etching, and a plurality of the slits are arranged at intervals; A plurality of noble metal particle strips, wherein the noble metal strips are strips formed by noble metal particles being modified into each of the slits.

[0009] In some embodiments, the two-dimensional phase change material substrate is a substrate formed of transition metal sulfide; and / or The noble metal particles are at least one of Pd, Au and Ag.

[0010] In some of the embodiments, a heating device is provided on the gas sensor, and the heating device is used to heat the gas sensitive element to periodically regenerate and restore the gas adsorption capacity of the gas sensitive element.

[0011] On the other hand, the present application also provides a leak rate detection method for a leak rate detection system for a gas-liquid two-phase working medium, comprising the following: Put the product to be tested into the vacuum container, and collect the current value passing through the gas sensor in real time; The leakage rate of the gas leaked from the product to be tested is calculated based on the collected current value passing through the gas sensor.

[0012] In some embodiments, the calculating the leakage rate of the gas leaked from the product to be tested based on the collected current value passing through the gas sensor specifically includes: Acquiring a gas concentration value in the vacuum container based on the collected current value passing through the gas sensor; The leakage rate of the gas leaked from the product to be tested is calculated based on the obtained gas concentration value in the vacuum container.

[0013] In some embodiments, the steps include: Step S1: placing the product to be tested into the vacuum container; Step S2: Obtaining the change △I of the gas concentration value; Step S3: introducing a standard leak hole with a known leak rate Q0, obtaining a gas concentration change of △I1, and calculating the leak rate Q by the following formula (1); (1).

[0014] In some of the embodiments, when the leakage rate of the gas leaked from the product to be tested is greater than a response set value, an alarm signal is issued.

[0015] In some of the embodiments, after the leak rate detection of the gas leakage of the product to be tested is completed, the gas sensor is heated to periodically regenerate and restore the gas adsorption capacity of the gas sensitive element.

[0016] After adopting the above technical solution, the present application has the following beneficial effects compared with the prior art.

[0017] 1. The leakage rate detection system for gas-liquid two-phase working fluid in the present application absorbs the leaked gas of the product to be tested through a gas sensor and calculates the leakage rate of the leaked gas of the product to be tested, thereby simplifying the leakage rate detection method, making up for the shortcomings of accuracy and sensitivity of actual working fluid leak detection, realizing accurate quantitative analysis, reducing the cost of the spacecraft development stage, and improving the efficiency and reliability of gas-liquid two-phase working fluid leak detection.

[0018] 2. The leak rate detection method of the leak rate detection system for gas-liquid two-phase working fluid in the present application uses the leak rate detection system for gas-liquid two-phase working fluid in the present application for leak rate detection, and therefore includes all the above-mentioned advantages of the leak rate detection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a leak rate detection system in an embodiment of the present application; Figure 2 is a schematic structural diagram of a gas sensing unit in an embodiment of the present application; Figure 3 is a schematic diagram of a leak rate detection system in an embodiment of the present application detecting a product to be tested; Figure 4 Schematic diagram of the leak rate detection system in the embodiment of the present application detecting a gas-liquid two-phase working medium; Figure 5 4 is a flow chart of a leak rate detection method of a leak rate detection system in an embodiment of the present application.

[0020] In the figure: 100, leak rate detection system; 110, gas sensor; 111, gas sensitive element; 1111, two-dimensional phase change material substrate; 1112, precious metal particle strip; 11121, precious metal particle; 1113, band gap; 112, shell; 120, vacuum container; 130, display device; 200, product to be tested; 210, leak point; 300, gas-liquid two-phase working fluid. DETAILED DESCRIPTION

[0021] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] On the one hand, the embodiment of the present application provides a leak rate detection system 100 for a gas-liquid two-phase working fluid 300, which is used to detect the sealing performance of aerospace products. The specific structure of the leak rate detection system 100 can be found in Figures 1 to 4 , which includes a vacuum container 120, a gas sensor 110 and a control device, wherein the gas sensor 110 is arranged in the vacuum container 120, the gas sensor 110 includes a gas sensitive element 111 and a detection element, the gas sensitive element 111 is used to absorb the leaked gas of the product to be tested 200 and change the resistance value of the gas sensor 110, and the detection element is used to collect the current value passing through the gas sensor 110 in real time; the control device is used to calculate the leakage rate of the gas leakage of the product to be tested 200 based on the collected current value passing through the gas sensor 110.

[0023] The leakage rate detection system 100 for the gas-liquid two-phase working fluid 300 in the present application absorbs the leaked gas of the product to be tested 200 through the gas sensor 110, and calculates the leakage rate of the leaked gas of the product to be tested 200, thereby simplifying the leakage rate detection method, making up for the shortcomings of the accuracy and sensitivity of actual working fluid leak detection, realizing accurate quantitative analysis, reducing the cost of the spacecraft development stage, and improving the efficiency and reliability of leak detection of the gas-liquid two-phase working fluid 300.

[0024] As an embodiment not shown, the gas sensor 110 also includes a data processing element for obtaining a gas concentration value in the vacuum container 120 based on a current value collected through the gas sensor 110, thereby obtaining the gas concentration value in the vacuum container 120 in real time. The control device is also used to calculate the leakage rate of the gas leakage of the product to be tested 200 based on the obtained gas concentration value in the vacuum container 120. By obtaining the gas concentration value in the vacuum container 120, a change in the gas concentration value is obtained, thereby calculating the leakage rate of the gas leakage of the product to be tested 200. The leakage rate detection method is simple, the leakage rate detection error is small, and the detection sensitivity and positioning accuracy are high.

[0025] For example, before the detection phase of the gas sensor 110 begins, the resistance value of the sensor is, after the detection phase begins, the gas sensitive element 111 captures gas molecules, and then the resistance of the gas sensor 110 changes. The voltage applied to the gas sensor 110 remains unchanged, and the current changes with the change in resistance, that is, the change in the gas concentration value in the vacuum container 120 is determined by the current size.

[0026] like Figure 1 , Figure 3 and Figure 4 As shown, the gas sensor 110 includes a shell 112, which has a mesh structure. A micro data processing device and a gas sensitive element 111 arranged on the micro data processing device are encapsulated in the shell 112, wherein the micro data processing device includes a PCB board, a signal processing circuit, an analog-to-digital conversion module, a wireless transmission module and an antenna. Exemplarily, the signal processing circuit, the analog-to-digital conversion module, the wireless transmission module and the antenna are sequentially soldered on the PCB board, the signal processing circuit is constructed as a detection element, the analog-to-digital conversion module is constructed as a data processing element, and the wireless transmission module is communicatively connected with the control device so that the control device can receive the current value collected by the detection element through the gas sensor 110 and / or the gas concentration value in the vacuum container 120 obtained by the data processing element.

[0027] For the specific structure of the gas sensor 111, please refer to Figures 1 to 3 It includes a two-dimensional phase change material substrate 1111 and a plurality of noble metal particle strips 1112, wherein the surface of the two-dimensional phase change material has slits formed by etching, and the plurality of slits are arranged at intervals; the noble metal strips are strips formed by modifying noble metal particles 11121 into each slit, and the noble metal particle strips 1112 grown in the band gap 1113 constructed on the two-dimensional phase change material substrate 1111, due to the controllability of the size and shape of the band gap 1113 and the selection of the noble metal type, the lattice vacancies on the formed gas sensitive element 111 can only be occupied by specific gas molecules, which affects the electrical properties of the two-dimensional phase change material.

[0028] Illustratively, on a two-dimensional phase change material substrate 1111, a band gap 1113 of a certain size is uniformly constructed by an ultrafast laser collaborative manufacturing method; on the band gap 1113 constructed on the two-dimensional phase change material substrate 1111, an additive-subtractive method is used to grow a certain shape of precious metal particles 11121 rows in the band gap 1113, and through surface regulation, modification and second phase recombination, room temperature or even low-temperature gas-sensitive materials with better performance are obtained.

[0029] As an implementation method not shown, the two-dimensional phase change material substrate 1111 is a substrate formed by transition metal sulfide, and the noble metal particles 11121 are at least one of Pd, Au and Ag, which can more accurately capture the gas molecules leaked from the product 200 to be tested.

[0030] As an embodiment not shown, a heating device is provided on the gas sensor 110, and the heating device is used to heat the gas sensitive element 111 for periodic regeneration to restore the gas adsorption capacity of the gas sensitive element 111. After the gas sensor 110 completes a gas-liquid two-phase working fluid 300 leak detection, the gas sensor 110 is heated to facilitate rapid regeneration of the gas sensor 110 and achieve reuse.

[0031] like Figure 1 , Figure 3 and Figure 4 As shown, the leak rate detection system 100 also includes a display device 130, which is connected to the control device and the gas sensor 110, and is used to display the gas concentration value in the vacuum container 120 and / or the leak rate of the leaked gas of the product to be tested 200. When the leak rate of the leaked gas of the product to be tested 200 is greater than the response set value, the display device 130 sends an alarm signal.

[0032] On the other hand, Figures 1 to 5 As shown, the embodiment of the present application also provides a preparation method of a leakage rate detection system 100 for a gas-liquid two-phase working fluid 300, comprising the following steps: placing the product to be tested into a vacuum container 120, and collecting the current value passing through the gas sensor 110 in real time; and calculating the leakage rate of the gas leaking from the product to be tested 200 based on the collected current value passing through the gas sensor 110.

[0033] The leak rate detection method of the leak rate detection system 100 for the gas-liquid two-phase working fluid 300 in the present application is simple. The gas sensor 110 adsorbs the leaked gas of the product to be tested 200, and calculates the leak rate of the leaked gas of the product to be tested 200. The leak rate detection method is simple, the leak rate detection error is small, the sensitivity and positioning accuracy are high, the cost of the spacecraft development stage is reduced, and the efficiency and reliability of the gas-liquid two-phase working fluid 300 leak detection are improved.

[0034] like Figure 5 As shown, in this embodiment, calculating the leakage rate of the gas leaked from the product to be tested 200 based on the collected current value passing through the gas sensor 110 specifically includes: obtaining the gas concentration value in the vacuum container 120 based on the collected current value passing through the gas sensor 110; calculating the leakage rate of the gas leaked from the product to be tested 200 based on the obtained gas concentration value in the vacuum container 120, the gas sensitive element 111 captures gas molecules, and then the resistance of the gas sensor 110 changes. In the detection stage, the gas sensitive element 111 captures the gas molecules leaked from the product to be tested 200, and its own resistance value changes. The voltage applied to it remains unchanged, and the current changes with the change in resistance, thereby determining the change in the gas concentration value in the vacuum container 120.

[0035] In this embodiment, the leak rate detection method specifically includes the following steps: Step S1: placing the product to be tested into the vacuum container 120; Step S2: Obtaining the change △I of the gas concentration value; Step S3: introducing a standard leak hole with a known leak rate Q0, obtaining a gas concentration change of △I1, and calculating the leak rate Q by the following formula (1); (1).

[0036] In this embodiment, when the leakage rate of the gas leaked by the product to be tested 200 is greater than the response set value, an alarm signal is issued and the gas concentration value in the vacuum container 120 is displayed at the same time.

[0037] In this embodiment, after the leak rate detection of the gas leakage of the product to be tested 200 is completed, the gas sensor 110 is heated to periodically regenerate and restore the gas adsorption capacity of the gas sensitive element 111 .

[0038] like Figure 1 , Figures 3 to 5 As shown, when the gas sensor 110 is used to detect the leak of the product 200 to be tested, if there is a leak point 210 in the product 200 to be tested, the gas working fluid leaked from the product 200 to be tested can be captured by the gas sensor 110, thereby changing the electrical properties of the gas sensitive element 111, and the control device can convert the electrical signal measured by the gas sensor 110 into the leakage rate of the product to be tested. , the leak detection of the tested product is completed. The reaction size of the gas sensor 110 is related to the time when the leak-indicating gas leaked from the leak point 210 of the tested product 200 reaches the gas sensor 110. The reaction value of the gas sensor 110 is large for long-term and continuous leakage.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0043] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A leakage rate detection system for gas-liquid two-phase working fluid, characterized in that: include: A vacuum container for containing the product to be tested; A gas sensor is arranged in the vacuum container, the gas sensor comprising a gas sensitive element for absorbing the leaked gas of the product to be tested and changing the resistance value of the gas sensor and a detection element for collecting the current value passing through the gas sensor; The control device is used to calculate the leakage rate of the gas leaked by the product to be tested based on the collected current value passing through the gas sensor.

2. The leakage rate detection system for gas-liquid two-phase working medium according to claim 1, characterized in that: The gas sensor also includes a data processing element for obtaining a gas concentration value in the vacuum container based on a current value collected passing through the gas sensor, and the control device is further used to calculate a leakage rate of the gas leakage of the product to be tested based on the obtained gas concentration value in the vacuum container.

3. The leakage rate detection system for gas-liquid two-phase working medium according to claim 1, characterized in that: The gas sensing element comprises: A two-dimensional phase change material substrate, wherein the surface of the two-dimensional phase change material has slits formed by etching, and a plurality of the slits are arranged at intervals; A plurality of noble metal particle strips, wherein the noble metal strips are strips formed by noble metal particles being modified into each of the slits.

4. The leakage rate detection system for gas-liquid two-phase working medium according to claim 3, characterized in that: The two-dimensional phase change material substrate is a substrate formed of transition metal sulfide; and / or The noble metal particles are at least one of Pd, Au and Ag.

5. The leakage rate detection system for gas-liquid two-phase working medium according to any one of claims 1 to 4, characterized in that: The gas sensor is provided with a heating device, which is used to heat the gas sensitive element so as to periodically regenerate and restore the gas adsorption capacity of the gas sensitive element.

6. A leak rate detection method for a leak rate detection system for a gas-liquid two-phase working medium according to any one of claims 1 to 5, characterized in that: Includes the following: Put the product to be tested into the vacuum container, and collect the current value passing through the gas sensor in real time; The leakage rate of the gas leaked from the product to be tested is calculated based on the collected current value passing through the gas sensor.

7. The leak rate detection method for a leak rate detection system for a gas-liquid two-phase working medium according to claim 6, characterized in that: The step of calculating the leakage rate of the gas leaked from the product to be tested based on the collected current value passing through the gas sensor specifically includes: Acquiring a gas concentration value in the vacuum container based on the collected current value passing through the gas sensor; The leakage rate of the gas leaked from the product to be tested is calculated based on the obtained gas concentration value in the vacuum container.

8. The leak rate detection method for a leak rate detection system for a gas-liquid two-phase working medium according to claim 7, characterized in that: The following steps are involved: Step S1: placing the product to be tested into the vacuum container; Step S2: Obtaining the change △I of the gas concentration value; Step S3: introducing a standard leak hole with a known leak rate Q0, obtaining a gas concentration change of △I1, and calculating the leak rate Q by the following formula (1); （1）。 9. The leak rate detection method for a leak rate detection system for a gas-liquid two-phase working medium according to any one of claims 6 to 8, characterized in that: When the leakage rate of the gas leaked by the product to be tested is greater than the response set value, an alarm signal is issued.

10. The leak rate detection method for a leak rate detection system for a gas-liquid two-phase working medium according to any one of claims 6 to 8, characterized in that: After the leak rate detection of the gas leakage of the product to be tested is completed, the gas sensor is heated to periodically regenerate and restore the gas adsorption capacity of the gas sensitive element.

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