A device and method for reusing and recovering helium in a helium leak test

Abstract

The application provides a device and method for repeatedly using and recycling helium in a helium leak detection test. The device for repeatedly using and recycling helium in a helium leak detection test comprises a gas storage tank, a forward gas pumping electric pump, a reverse gas pumping electric pump, an on-off hand valve, a gas supply interface, a pressure detection assembly, a helium concentration detection assembly and a computer. The gas storage tank is communicated with the forward gas pumping electric pump and the reverse gas pumping electric pump through pipelines. The forward gas pumping electric pump and the reverse gas pumping electric pump are communicated with the on-off hand valve through pipelines. The on-off hand valve is communicated with the gas supply interface through a pipeline. The pressure detection assembly is communicated with the gas storage tank and the gas supply interface through pipelines. The helium concentration detection assembly is communicated with the gas storage tank and the gas supply interface through pipelines. The computer is electrically connected with the pressure detection assembly and the helium concentration detection assembly.

Description

Technical Field

[0001] This invention relates to the field of helium leak detection testing technology for rocket engines, and in particular to an apparatus and method for reusing and recovering helium gas in helium leak detection testing. Background Technology

[0002] Helium leak detection for rocket engines is the most precise sealing inspection method in the aerospace field. Its core principle is to use helium as a tracer gas and a mass spectrometer to detect micro-leakage, ensuring zero leakage and high reliability of the engine under extreme operating conditions. Its key functions are as follows: 1. Extremely high sensitivity detection: capable of detecting 10 -7 -10 -9 Pa·m 3 The micro-leakage rate at the / s level is far superior to bubble and hydrostatic methods, covering all potential leak points such as welds, sealing surfaces, and pipe joints.

[0003] 2. Ensure safety under extreme operating conditions: Verify the sealing reliability of the liquid hydrogen / liquid oxygen / helium pressurization system under low temperature, high pressure, vacuum and vibration conditions to prevent propellant leakage, abnormal thrust and explosion risks.

[0004] 3. Dual function of positioning and quantification: It can accurately locate the leak point (such as flange, weld, valve seat) and quantify the leakage rate, providing data basis for repair and acceptance.

[0005] 4. Full life cycle quality control: covering the entire process from component assembly, testing, to pre-launch, it is a mandatory threshold for rocket engine manufacturing and launch permits.

[0006] Currently, the helium leak detection method is commonly used for rocket engines. This involves filling the engine cavity with helium at a certain pressure and then using a helium leak detector's suction gun to scan and locate potential leaks. This method allows for rapid on-site location of leaks and is flexible and reliable. However, this method consumes a large amount of irreplaceable helium, and the helium cannot be recovered after the test.

[0007] Helium, a non-renewable resource generated during geological activities, can only be extracted from natural gas and is difficult to synthesize artificially. It is also highly volatile and difficult to store for long periods. In the context of war, both its price and supply face severe challenges, and helium will be upgraded from a "common industrial gas" to a strategic resource, leading countries to strengthen stockpiling and export controls. In one month alone, the price of helium increased by more than 60% compared to the previous month.

[0008] In response to the challenges of helium leak testing for engines, including the necessity of helium, rising helium prices, and supply shortages, this invention provides a device for reusing and recovering helium during engine leak testing. This significantly reduces the amount of helium used in engine leak testing, thereby lowering enterprise costs. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing an apparatus and method for reusing and recovering helium gas in a helium leak detection test.

[0010] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A device for reusing and recovering helium gas in a helium leak detection test, comprising: a gas storage tank, a forward pump, a reverse pump, a manual valve, a gas supply interface, a pressure detection component, a helium concentration detection component, and a computer. The gas storage tank is connected to the forward pump and the reverse pump via pipelines. The forward pump and the reverse pump are both connected to the manual valve via pipelines. The manual valve is connected to the gas supply interface via pipelines. The pressure detection component is connected to the gas storage tank and the gas supply interface via pipelines. The helium concentration detection component is connected to the gas storage tank and the gas supply interface via pipelines. The computer is electrically connected to the pressure detection component and the helium concentration detection component.

[0011] The beneficial effects of adopting the technical solution of this invention are that the function of the gas storage tank is to store a mixture of air and helium, and it is a high-pressure container with sufficient pressure resistance. A forward-pumping electric pump draws the helium-nitrogen mixture from the engine cavity into the gas storage tank. A reverse-pumping electric pump draws the helium-nitrogen mixture from the gas storage tank into the engine cavity. A pressure sensor detects the pressure in the gas tank or engine cavity; a helium concentration sensor detects the helium concentration in the gas tank or engine cavity. After collecting relevant data, the computer calculates the helium percentage in the helium-nitrogen mixture, and then displays the helium leak detection safety value to the inspectors on the screen. This invention is used for the recovery, storage, and recycling of helium after helium leak detection in rocket engines. The recovery rate is improved by the suction pump, and the entire process is monitored by sensors and a computer. It can significantly reduce the amount of helium used in engine helium leak detection tests, reducing costs. It features simplicity, reliability, high reusability, safety, and environmental friendliness. By recycling and reusing helium, the amount of helium that was previously only enough for one engine helium leak test can be used for six to eight engine helium leak tests. The final mixture is then sent to a helium manufacturer for recycling and purification, thereby reducing the waste of helium resources.

[0012] Furthermore, the pressure detection component includes a gas tank pressure sensor and an engine pressure sensor, and the helium concentration detection component includes a first helium concentration sensor and a second helium concentration sensor. The gas tank pressure sensor and the first helium concentration sensor are both connected to the gas tank through pipelines, and the engine pressure sensor and the second helium concentration sensor are both connected to the gas supply interface through pipelines. The computer is electrically connected to the gas tank pressure sensor, the engine pressure sensor, the first helium concentration sensor, and the second helium concentration sensor, respectively.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that the pressure sensor detects the pressure inside the gas tank or engine cavity; the helium concentration sensor is responsible for detecting the concentration of helium in the gas tank or engine cavity. After collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspection personnel of the current helium leak detection safety value through the display screen.

[0014] Furthermore, a first check valve is installed on the pipeline between the gas storage tank and the forward pump, and a second check valve is installed on the pipeline between the gas storage tank and the reverse pump.

[0015] The beneficial effect of adopting the above-mentioned further technical solution is that the one-way valve is used to ensure unidirectional gas flow and prevent backflow.

[0016] Furthermore, a first filter is installed on the pipeline between the forward suction pump and the manual valve, and a second filter is installed on the pipeline between the reverse suction pump and the manual valve.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is that the filter is used to purify the recovered gas and remove excess substances.

[0018] Furthermore, the computer is electrically connected to a display.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that after collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspector of the helium leak detection safety value at this time through the display screen.

[0020] Furthermore, the gas supply interface is detachably connected to the rocket engine via a pipeline, and the gas storage tank is equipped with a helium-nitrogen mixture.

[0021] The advantages of adopting the above-mentioned further technical solution are that it facilitates quick connection and disconnection of the gas supply interface from the engine. It also facilitates helium leak testing of the engine using a device that reuses and recovers helium gas during helium leak testing.

[0022] Furthermore, this invention also provides a method for reusing and recovering helium gas in a helium leak detection test. Based on the aforementioned apparatus for reusing and recovering helium gas in a helium leak detection test, the method includes: a leak detection and charging stage, in cases where it is not the first helium leak detection, opening the reverse suction pump and the manual valve to allow the helium-nitrogen mixture in the storage tank to be charged into the engine and pressurized to the test pressure; detecting the pressure and mixture concentration using a pressure detection component and a helium concentration detection component respectively, and transmitting the pressure and mixture concentration to a computer; a leak detection stage, closing the manual valve, entering the helium mass spectrometry leak detection stage, where the computer monitors the leak detection process using data from the pressure detection component and the helium concentration detection component. The pressure process ensures stable leak detection conditions and provides the required helium leak rate value for safety. Inspection operators conduct helium leak tests based on this value. During the helium recovery phase, the forward pump and manual valve are activated to recover the high-pressure helium-nitrogen mixture from the engine cavity into the storage tank. In the reuse phase, if the amount and ratio of the helium-nitrogen mixture in the storage tank meet the preset ratio, the leak detection, filling, and recovery phases are repeated, performing multiple helium leak tests on the same type of engine. In the factory reuse phase, if the amount and ratio of the helium-nitrogen mixture in the storage tank do not meet the preset ratio, the reverse pump is used to return the helium-nitrogen mixture to the factory for reuse.

[0023] The beneficial effects of adopting the technical solution of this invention are that the function of the gas storage tank is to store a mixture of air and helium, and it is a high-pressure container with sufficient pressure resistance. A forward-pumping electric pump draws the helium-nitrogen mixture from the engine cavity into the gas storage tank. A reverse-pumping electric pump draws the helium-nitrogen mixture from the gas storage tank into the engine cavity. A pressure sensor detects the pressure in the gas tank or engine cavity; a helium concentration sensor detects the helium concentration in the gas tank or engine cavity. After collecting relevant data, the computer calculates the helium percentage in the helium-nitrogen mixture, and then displays the helium leak detection safety value to the inspectors on the screen. This invention is used for the recovery, storage, and recycling of helium after helium leak detection in rocket engines. The recovery rate is improved by the suction pump, and the entire process is monitored by sensors and a computer. It can significantly reduce the amount of helium used in engine helium leak detection tests, reducing costs. It features simplicity, reliability, high reusability, safety, and environmental friendliness. By recycling and reusing helium, the amount of helium that was previously only enough for one engine helium leak test can be used for six to eight engine helium leak tests. The final mixture is then sent to a helium manufacturer for recycling and purification, thereby reducing the waste of helium resources.

[0024] Furthermore, the leak detection and charging stage includes: in the case of the first helium leak test, helium gas at the rated test pressure is supplied by the gas distribution unit to charge the engine interior, and the device for reusing and recovering helium gas during the helium leak test does not activate; in the case of subsequent helium leak tests, the reverse suction pump and the manual valve are opened, allowing the helium-nitrogen mixture in the gas tank to be charged into the engine interior through the second one-way valve, the reverse suction pump, the second filter, the manual valve, and the gas supply interface, and pressurized to the test pressure; the pressure is monitored in real time by the gas tank pressure sensor and the engine pressure sensor, and the mixture concentration is monitored by the first helium concentration sensor and the second helium concentration sensor, and the pressure and mixture concentration are transmitted to the computer; the helium recovery stage includes: opening the forward suction pump and the manual valve, allowing the high-pressure helium-nitrogen mixture in the engine cavity to be recovered into the gas tank through the manual valve, the first filter, the forward suction pump, and the first one-way valve; the first one-way valve prevents gas backflow, and the first filter removes impurities from the recovered gas.

[0025] The beneficial effects of adopting the above-mentioned further technical solution are that the pressure sensor detects the pressure inside the gas tank or engine cavity; the helium concentration sensor is responsible for detecting the concentration of helium in the gas tank or engine cavity. After collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspector of the current helium leak detection safety value through the display screen. A one-way valve is used to ensure unidirectional gas flow and prevent backflow. A filter is used to purify the recovered gas and remove excess substances.

[0026] Furthermore, the leak detection phase includes: closing the manual valve to isolate the engine from the helium reuse and recovery device in the helium leak test, and entering the helium mass spectrometry leak detection stage; the computer monitors the pressure holding process using data from the gas tank pressure sensor, engine pressure sensor, first helium concentration sensor, and second helium concentration sensor to ensure stable leak detection conditions, and provides the helium leak detection safety requirement leak rate value. The inspection operator conducts the helium leak detection test according to the helium leak detection safety requirement leak rate value; if the leak rate is qualified, the helium recovery stage begins; if it is unqualified, the leak point is marked, repaired, and then refilled for leak detection.

[0027] The beneficial effects of adopting the above-mentioned further technical solution are that the pressure sensor detects the pressure inside the gas tank or engine cavity; the helium concentration sensor is responsible for detecting the concentration of helium in the gas tank or engine cavity. After collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspector of the current helium leak detection safety value through the display screen. A one-way valve is used to ensure unidirectional gas flow and prevent backflow. A filter is used to purify the recovered gas and remove excess substances.

[0028] Furthermore, the reuse phase includes: when the amount and helium ratio of the helium-nitrogen mixture in the storage tank meet the minimum 10%, repeating the leak detection and filling phase, the leak detection phase, and the helium recovery phase, performing multiple helium leak tests on the same type of engine; the return-to-factory reuse phase includes: when the amount and helium ratio of the helium-nitrogen mixture in the storage tank do not meet the 10% requirement, using a reverse-pump electric pump to extract the helium-nitrogen mixture from the storage tank and place it into other gas cylinders, returning them to the helium supplier for purification and reuse, thus realizing the recycling and reuse of helium resources.

[0029] The beneficial effect of adopting the above-mentioned further technical solution is that, assuming the engine helium leak test passes smoothly and sufficient helium is recovered, one helium fill on the gas distribution unit is enough for this device to perform 6-8 engine helium leak tests. Through recycling and reuse, the amount of helium previously sufficient for only one engine helium leak test can be used for six to eight engine helium leak tests, and the final mixture can be sent to the helium manufacturer for recycling and purification, thereby reducing the waste of helium resources, realizing the recycling and reuse of helium resources, and transforming non-renewable helium resources into mostly recyclable resources.

[0030] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the device for reusing and recovering helium gas in a helium leak detection test provided in an embodiment of the present invention.

[0033] Figure 2 A schematic diagram illustrating the workflow of the apparatus for reusing and recovering helium gas in a helium leak detection test provided in an embodiment of the present invention.

[0034] Reference numerals: 1. Gas tank; 2. Forward suction pump; 3. Reverse suction pump; 4. Hand valve; 5. Gas supply interface; 6. Computer; 7. Gas tank pressure sensor; 8. Engine pressure sensor; 9. First helium concentration sensor; 10. Second helium concentration sensor; 11. First check valve; 12. Second check valve; 13. First filter; 14. Second filter; 15. Display; 16. Oxygen pump; 17. Methane pump; 18. Turbine; 19. Exhaust pipe; 20. Thrust chamber; 21. Nozzle; 22. Generator; 23. Gas distribution platform; 24. Oxygen cylinder. Detailed Implementation

[0035] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0040] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0041] like Figure 1 and Figure 2 As shown in the figure, this embodiment of the invention provides a device for reusing and recovering helium gas in a helium leak detection test, comprising: a gas storage tank 1, a forward pump 2, a reverse pump 3, a manual valve 4, a gas supply interface 5, a pressure detection component, a helium concentration detection component, and a computer 6. The gas storage tank 1 is connected to the forward pump 2 and the reverse pump 3 via pipelines. The forward pump 2 and the reverse pump 3 are both connected to the manual valve 4 via pipelines. The manual valve 4 is connected to the gas supply interface 5 via pipelines. The pressure detection component is connected to the gas storage tank 1 and the gas supply interface 5 via pipelines. The helium concentration detection component is connected to the gas storage tank 1 and the gas supply interface 5 via pipelines. The computer 6 is electrically connected to the pressure detection component and the helium concentration detection component.

[0042] The beneficial effects of adopting the technical solution of this invention are that the function of the gas storage tank is to store a mixture of air and helium, and it is a high-pressure container with sufficient pressure resistance. A forward-pumping electric pump draws the helium-nitrogen mixture from the engine cavity into the gas storage tank. A reverse-pumping electric pump draws the helium-nitrogen mixture from the gas storage tank into the engine cavity. A pressure sensor detects the pressure in the gas tank or engine cavity; a helium concentration sensor detects the helium concentration in the gas tank or engine cavity. After collecting relevant data, the computer calculates the helium percentage in the helium-nitrogen mixture, and then displays the helium leak detection safety value to the inspectors on the screen. This invention is used for the recovery, storage, and recycling of helium after helium leak detection in rocket engines. The recovery rate is improved by the suction pump, and the entire process is monitored by sensors and a computer. It can significantly reduce the amount of helium used in engine helium leak detection tests, reducing costs. It features simplicity, reliability, high reusability, safety, and environmental friendliness. By recycling and reusing helium, the amount of helium that was previously only enough for one engine helium leak test can be used for six to eight engine helium leak tests. The final mixture is then sent to a helium manufacturer for recycling and purification, thereby reducing the waste of helium resources.

[0043] Figure 1 The arrows in the diagram can indicate the direction and trajectory of gas flow.

[0044] like Figure 1 and Figure 2 As shown, the pressure detection component further includes a gas tank pressure sensor 7 and an engine pressure sensor 8, and the helium concentration detection component includes a first helium concentration sensor 9 and a second helium concentration sensor 10. The gas tank pressure sensor 7 and the first helium concentration sensor 9 are both connected to the gas storage tank 1 through pipelines, and the engine pressure sensor 8 and the second helium concentration sensor 10 are both connected to the gas supply interface 5 through pipelines. The computer 6 is electrically connected to the gas tank pressure sensor 7, the engine pressure sensor 8, the first helium concentration sensor 9, and the second helium concentration sensor 10 respectively.

[0045] The beneficial effect of adopting the above-mentioned further technical solution is that the pressure sensor detects the pressure inside the gas tank or engine cavity; the helium concentration sensor is responsible for detecting the concentration of helium in the gas tank or engine cavity. After collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspection personnel of the current helium leak detection safety value through the display screen.

[0046] like Figure 1 and Figure 2 As shown, a first check valve 11 is further provided on the pipeline between the gas storage tank 1 and the forward suction electric pump 2, and a second check valve 12 is provided on the pipeline between the gas storage tank 1 and the reverse suction electric pump 3.

[0047] The beneficial effect of adopting the above-mentioned further technical solution is that the one-way valve is used to ensure unidirectional gas flow and prevent backflow.

[0048] like Figure 1 and Figure 2 As shown, a first filter 13 is provided on the pipeline between the forward air pump 2 and the switch valve 4, and a second filter 14 is provided on the pipeline between the reverse air pump 3 and the switch valve 4.

[0049] The beneficial effect of adopting the above-mentioned further technical solution is that the filter is used to purify the recovered gas and remove excess substances.

[0050] like Figure 1 and Figure 2 As shown, the computer 6 is further electrically connected to a display 15.

[0051] The beneficial effect of adopting the above-mentioned further technical solution is that after collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspector of the helium leak detection safety value at this time through the display screen.

[0052] like Figure 1 and Figure 2 As shown, further, the gas supply interface 5 is detachably connected to the rocket engine through a pipeline, and a helium-nitrogen mixture is provided in the gas storage tank 1.

[0053] The beneficial effects of adopting the above further technical solution are that it is convenient for the gas supply interface to be quickly connected to and disassembled from the engine, and it is convenient to carry out a helium leak detection test on the engine by means of a device that can reuse and recycle helium gas during the helium leak detection test.

[0054] The present invention provides a device for reusing and recycling helium gas during a helium leak detection test, which can be a device for reusing and recycling helium gas during an engine helium leak detection test (hereinafter referred to as "this device"). For a rocket engine, good sealing performance is a necessary condition for its normal operation, and the helium leak detection test is an important means to test the sealing performance of the engine. A large amount of helium gas is required in the helium leak detection test, and helium gas is a non-renewable resource with wide applications and is a strategic resource in the future. Therefore, it is very necessary to save helium gas.

[0055] According to the linear ratio leak rate principle of using a helium-nitrogen mixture, the present invention designs a device for reusing and recycling helium gas during a helium leak detection test, which can be a device for recycling and completely recovering a helium-nitrogen mixture during a rocket engine helium leak detection test, and can greatly reduce the helium gas consumption during the engine helium leak detection test. This device has the characteristics of being simple and reliable, having a high reuse rate, being safe and environmentally friendly, etc.

[0056] Helium-nitrogen mixture can be used for engine helium leak detection. According to the requirements of 《ISO 20485》, the proportion of helium in the mixture should not be less than 10%. At this time, the helium leak rate is linearly amplified according to the proportion of helium in the mixture. For example, when a certain inner cavity is filled with 30 MPa of helium-nitrogen mixture for helium leak detection, 9 MPa of helium is filled, accounting for 30%. Then the calculation method of the actual helium leak rate value is the leak rate shown on the helium leak detector multiplied by 1 / 0.3, that is, the leak rate value required for engine helium leak detection safety should be multiplied by 1 / 0.3. As long as the leak rate shown on the helium leak detector is lower than this safety requirement leak rate value, it can be regarded as passing the inspection.

[0057] In view of the situation that helium gas must be used in the engine helium leak detection test, the price of helium gas is rising continuously, and the supply of helium gas is difficult, the present invention provides a device for reusing and recycling helium gas during the engine helium leak detection test, thereby greatly reducing the helium gas consumption in the engine helium leak detection test to reduce costs. Through recycling and reuse, this device can use the helium gas volume that was only enough for one engine helium leak detection test before to carry out six to eight engine helium leak detection tests, and hand over the final mixture to a helium gas manufacturer for recovery and purification, thereby reducing the waste of helium gas resources, achieving almost perfect helium gas recovery and utilization, and greatly reducing the inspection costs of enterprises.

[0058] The configuration of this device is as Figure 1As shown, it mainly consists of a gas storage tank, a one-way valve, a vacuum pump, a filter, a one-way valve, a manual valve, a pressure sensor, and a helium concentration sensor.

[0059] The gas storage tank is a high-pressure container with sufficient pressure resistance, used to store a mixture of air and helium. A one-way valve and filter ensure unidirectional gas flow, preventing backflow and purifying the recovered gas while removing impurities. A forward-flowing electric pump draws the helium-nitrogen mixture from the engine cavity into the storage tank; a reverse-flowing electric pump draws the mixture from the storage tank into the engine cavity. A pressure sensor detects the pressure in the gas tank or engine cavity. A helium concentration sensor detects the helium concentration in the gas tank or engine cavity. After collecting relevant data, a computer calculates the helium percentage in the helium-nitrogen mixture and displays the helium leak detection safety value to the inspector.

[0060] like Figure 2 As shown, the rocket engine can be equipped with an oxygen pump 16, a methane pump 17, a turbine 18, an exhaust pipe 19, a thrust chamber 20, a nozzle 21, and a generator 22. The oxygen pump 16, the methane pump 17, the turbine 18, and the exhaust pipe 19 are connected in sequence. The thrust chamber 20 is connected to the nozzle 21, and the generator 22 is connected to the thrust chamber 20.

[0061] The gas distribution platform 23 can be connected to an oxygen cylinder 24. The gas distribution platform 23 and the device for reusing and recovering helium in the helium leak test are respectively connected to the exhaust pipe 19 and the nozzle 21 through pipelines.

[0062] Furthermore, this invention also provides a method for reusing and recovering helium gas in a helium leak detection test. Based on the aforementioned apparatus for reusing and recovering helium gas in a helium leak detection test, the method includes: a leak detection and charging stage, in cases where it is not the first helium leak detection, opening the reverse suction pump and the manual valve to allow the helium-nitrogen mixture in the storage tank to be charged into the engine and pressurized to the test pressure; detecting the pressure and mixture concentration using a pressure detection component and a helium concentration detection component respectively, and transmitting the pressure and mixture concentration to a computer; a leak detection stage, closing the manual valve, entering the helium mass spectrometry leak detection stage, where the computer monitors the leak detection process using data from the pressure detection component and the helium concentration detection component. The pressure process ensures stable leak detection conditions and provides the required helium leak rate value for safety. Inspection operators conduct helium leak tests based on this value. During the helium recovery phase, the forward pump and manual valve are activated to recover the high-pressure helium-nitrogen mixture from the engine cavity into the storage tank. In the reuse phase, if the amount and ratio of the helium-nitrogen mixture in the storage tank meet the preset ratio, the leak detection, filling, and recovery phases are repeated, performing multiple helium leak tests on the same type of engine. In the factory reuse phase, if the amount and ratio of the helium-nitrogen mixture in the storage tank do not meet the preset ratio, the reverse pump is used to return the helium-nitrogen mixture to the factory for reuse.

[0063] The beneficial effects of adopting the technical solution of this invention are that the function of the gas storage tank is to store a mixture of air and helium, and it is a high-pressure container with sufficient pressure resistance. A forward-pumping electric pump draws the helium-nitrogen mixture from the engine cavity into the gas storage tank. A reverse-pumping electric pump draws the helium-nitrogen mixture from the gas storage tank into the engine cavity. A pressure sensor detects the pressure in the gas tank or engine cavity; a helium concentration sensor detects the helium concentration in the gas tank or engine cavity. After collecting relevant data, the computer calculates the helium percentage in the helium-nitrogen mixture, and then displays the helium leak detection safety value to the inspectors on the screen. This invention is used for the recovery, storage, and recycling of helium after helium leak detection in rocket engines. The recovery rate is improved by the suction pump, and the entire process is monitored by sensors and a computer. It can significantly reduce the amount of helium used in engine helium leak detection tests, reducing costs. It features simplicity, reliability, high reusability, safety, and environmental friendliness. By recycling and reusing helium, the amount of helium that was previously only enough for one engine helium leak test can be used for six to eight engine helium leak tests. The final mixture is then sent to a helium manufacturer for recycling and purification, thereby reducing the waste of helium resources.

[0064] Furthermore, the leak detection and charging stage includes: in the case of the first helium leak test, helium gas at the rated test pressure is supplied by the gas distribution unit to charge the engine interior, and the device for reusing and recovering helium gas during the helium leak test does not activate; in the case of subsequent helium leak tests, the reverse suction pump and the manual valve are opened, allowing the helium-nitrogen mixture in the gas tank to be charged into the engine interior through the second one-way valve, the reverse suction pump, the second filter, the manual valve, and the gas supply interface, and pressurized to the test pressure; the pressure is monitored in real time by the gas tank pressure sensor and the engine pressure sensor, and the mixture concentration is monitored by the first helium concentration sensor and the second helium concentration sensor, and the pressure and mixture concentration are transmitted to the computer; the helium recovery stage includes: opening the forward suction pump and the manual valve, allowing the high-pressure helium-nitrogen mixture in the engine cavity to be recovered into the gas tank through the manual valve, the first filter, the forward suction pump, and the first one-way valve; the first one-way valve prevents gas backflow, and the first filter removes impurities from the recovered gas.

[0065] The beneficial effects of adopting the above-mentioned further technical solution are that the pressure sensor detects the pressure inside the gas tank or engine cavity; the helium concentration sensor is responsible for detecting the concentration of helium in the gas tank or engine cavity. After collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspector of the current helium leak detection safety value through the display screen. A one-way valve is used to ensure unidirectional gas flow and prevent backflow. A filter is used to purify the recovered gas and remove excess substances.

[0066] Furthermore, the leak detection phase includes: closing the manual valve to isolate the engine from the helium reuse and recovery device in the helium leak test, and entering the helium mass spectrometry leak detection stage; the computer monitors the pressure holding process using data from the gas tank pressure sensor, engine pressure sensor, first helium concentration sensor, and second helium concentration sensor to ensure stable leak detection conditions, and provides the helium leak detection safety requirement leak rate value. The inspection operator conducts the helium leak detection test according to the helium leak detection safety requirement leak rate value; if the leak rate is qualified, the helium recovery stage begins; if it is unqualified, the leak point is marked, repaired, and then refilled for leak detection.

[0067] The beneficial effects of adopting the above-mentioned further technical solution are that the pressure sensor detects the pressure inside the gas tank or engine cavity; the helium concentration sensor is responsible for detecting the concentration of helium in the gas tank or engine cavity. After collecting relevant data, the computer calculates the proportion of helium in the helium-nitrogen mixture, and then informs the inspector of the current helium leak detection safety value through the display screen. A one-way valve is used to ensure unidirectional gas flow and prevent backflow. A filter is used to purify the recovered gas and remove excess substances.

[0068] Furthermore, the reuse phase includes: when the amount and helium ratio of the helium-nitrogen mixture in the storage tank meet the minimum 10%, repeating the leak detection and filling phase, the leak detection phase, and the helium recovery phase, performing multiple helium leak tests on the same type of engine; the return-to-factory reuse phase includes: when the amount and helium ratio of the helium-nitrogen mixture in the storage tank do not meet the 10% requirement, using a reverse-pump electric pump to extract the helium-nitrogen mixture from the storage tank and place it into other gas cylinders, returning them to the helium supplier for purification and reuse, thus realizing the recycling and reuse of helium resources.

[0069] The beneficial effect of adopting the above-mentioned further technical solution is that, assuming the engine helium leak test passes smoothly and sufficient helium is recovered, one helium fill on the gas distribution unit is enough for this device to perform 6-8 engine helium leak tests. Through recycling and reuse, the amount of helium previously sufficient for only one engine helium leak test can be used for six to eight engine helium leak tests, and the final mixture can be sent to the helium manufacturer for recycling and purification, thereby reducing the waste of helium resources, realizing the recycling and reuse of helium resources, and transforming non-renewable helium resources into mostly recyclable resources.

[0070] This device is used for the recovery, storage, and recycling of helium after helium leak detection in rocket engines. It utilizes a suction pump to increase the recovery rate and combines sensors and a computer to achieve full-process monitoring. The complete workflow of this device can be divided into five stages: leak detection and filling → leak detection → helium recovery → reuse → return to the factory for further processing. 1. Leak detection and inflation stage Connect the external air supply interface to the rocket engine and open the switch valve.

[0071] In the case of the first helium leak test, the engine is filled with helium gas at the rated test pressure provided by the gas distribution station, and this device does not activate; in the case of subsequent helium leak tests, the reverse suction pump is turned on, and the helium-nitrogen mixture in the gas tank is filled into the engine through the one-way valve → reverse suction pump → filter → switch manual valve → gas supply interface, and pressurized to the test pressure.

[0072] An engine pressure sensor monitors the pressure in real time, a helium concentration sensor monitors the mixture concentration, and the data is transmitted synchronously to a computer.

[0073] 2. Leak Detection Stage With the manual valve closed, the engine is isolated from the device, and the helium mass spectrometer leak detection process begins (the leak detector is not shown in the diagram; it is an external auxiliary device).

[0074] The computer monitors the pressure holding process using data from pressure / concentration sensors to ensure stable leak detection conditions, and provides the required helium leak rate value at this point. Inspection personnel then conduct helium leak detection tests based on this safety value.

[0075] If the leakage rate is acceptable, the process proceeds to the recovery phase; if it is unacceptable, the leak point is marked, repaired, and then refilled for leak testing.

[0076] 3. Helium recovery stage (core) When the forward vacuum pump is started, the high-pressure helium-nitrogen mixture in the engine cavity is recovered into the gas tank through the switch valve → filter → forward vacuum pump → check valve.

[0077] A one-way valve prevents gas backflow, and a filter removes impurities (such as oil and particulate matter) from the recovered gas.

[0078] 4. Reuse Phase Assuming the helium-nitrogen mixture in the gas tank has a minimum helium ratio of 10%, steps 1-3 can be repeated to perform multiple helium leak tests on the same type of engine. If the engine helium test passes smoothly and the gas is fully recovered, one helium fill of the gas distribution unit is sufficient for this device to perform 6-8 engine helium leak tests.

[0079] 5. Return to factory for reuse stage If the amount of helium-nitrogen mixture and the helium ratio in the storage tank do not meet the 10% requirement, the gas stored in the storage tank can be extracted by a reverse pump and placed into other gas cylinders, which can then be returned to the helium supplier for purification and reuse. This achieves the recycling and reuse of helium resources, eliminating waste and transforming non-renewable helium resources into mostly recyclable resources.

[0080] Taking a certain type of 80-ton-class liquid oxygen-methane engine as an example, in a conventional helium leak test (without recycling), a 40L cylinder of helium at 12.5MPa is only enough for two helium leak tests on one engine. With this device, theoretically, the same cylinder of helium is sufficient for 10-20 helium leak tests, significantly reducing the helium usage costs for enterprises. Furthermore, most of the helium can be recycled and reused by helium manufacturers in the form of a helium-nitrogen mixture, making it environmentally friendly and energy-saving.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for reusing and recovering helium gas in a helium leak detection test, characterized in that, include: The system includes a gas storage tank, a forward pump, a reverse pump, a manual valve, a gas supply interface, a pressure detection component, a helium concentration detection component, and a computer. The gas storage tank is connected to both the forward and reverse pumps via pipelines. Both the forward and reverse pumps are connected to the manual valve via pipelines. The manual valve is connected to the gas supply interface via a pipeline. The pressure detection component is connected to both the gas storage tank and the gas supply interface via pipelines. The helium concentration detection component is connected to both the gas storage tank and the gas supply interface via pipelines. The computer is electrically connected to both the pressure detection component and the helium concentration detection component.

2. The apparatus for reusing and recovering helium gas in a helium leak detection test according to claim 1, characterized in that, The pressure detection component includes a gas tank pressure sensor and an engine pressure sensor. The helium concentration detection component includes a first helium concentration sensor and a second helium concentration sensor. The gas tank pressure sensor and the first helium concentration sensor are both connected to the gas tank through pipelines. The engine pressure sensor and the second helium concentration sensor are both connected to the gas supply interface through pipelines. The computer is electrically connected to the gas tank pressure sensor, the engine pressure sensor, the first helium concentration sensor, and the second helium concentration sensor, respectively.

3. The apparatus for reusing and recovering helium gas in a helium leak detection test according to claim 1, characterized in that, A first check valve is installed on the pipeline between the gas storage tank and the forward pump, and a second check valve is installed on the pipeline between the gas storage tank and the reverse pump.

4. The apparatus for reusing and recovering helium gas in a helium leak detection test according to claim 1, characterized in that, A first filter is installed on the pipeline between the forward suction pump and the manual valve, and a second filter is installed on the pipeline between the reverse suction pump and the manual valve.

5. The apparatus for reusing and recovering helium gas in a helium leak detection test according to claim 1, characterized in that, The computer is electrically connected to a monitor.

6. The apparatus for reusing and recovering helium gas in a helium leak detection test according to claim 1, characterized in that, The gas supply interface is detachably connected to the rocket engine via a pipeline, and the gas storage tank is equipped with a helium-nitrogen mixture.

7. A method for reusing and recovering helium gas in a helium leak detection test, characterized in that, According to any one of claims 1 to 6, the apparatus for reusing and recovering helium in a helium leak detection test includes the following method: During the leak detection and charging phase, if it is not the first helium leak test, the reverse suction pump and the manual valve are turned on to allow the helium-nitrogen mixture in the gas tank to be charged into the engine and pressurized to the test pressure; the pressure and mixture concentration are detected by the pressure detection component and the helium concentration detection component respectively, and the pressure and mixture concentration are transmitted to the computer. During the leak detection phase, the manual valve is closed, and the helium mass spectrometry leak detection process begins. The computer monitors the pressure holding process using data from the pressure detection component and the helium concentration detection component to ensure stable leak detection conditions. It also provides the helium leak detection safety requirement leak rate value, and the inspection operator conducts the helium leak detection test according to the helium leak detection safety requirement leak rate value. During the helium recovery phase, the forward suction pump is turned on and the manual valve is switched on, so that the high-pressure helium-nitrogen mixture in the engine cavity is recovered into the storage tank. In the reuse phase, under the condition that the amount of helium-nitrogen mixture and the helium ratio in the gas tank meet the preset ratio, the process of repeated leak detection and filling phase, leak detection phase and helium recovery phase is carried out to perform helium leak detection multiple times on the same type of engine. During the reprocessing phase, if the volume and helium ratio of the helium-nitrogen mixture in the storage tank do not meet the preset ratio, the helium-nitrogen mixture in the storage tank is recycled back to the factory using a reverse-pump electric pump.

8. A method for reusing and recovering helium gas in a helium leak detection test according to claim 7, characterized in that, The leak detection and charging phase includes: in the case of the first helium leak test, the engine is charged with helium at the rated test pressure provided by the gas distribution unit, and the device for reusing and recovering helium during the helium leak test does not activate. In cases other than the first helium leak test, the reverse suction pump and the manual valve are turned on, allowing the helium-nitrogen mixture in the storage tank to be pumped into the engine through the second one-way valve, the reverse suction pump, the second filter, the manual valve, and the gas supply interface, and pressurized to the test pressure; the pressure is monitored in real time by the tank pressure sensor and the engine pressure sensor, and the mixture concentration is monitored by the first helium concentration sensor and the second helium concentration sensor, and the pressure and mixture concentration are transmitted to the computer; The helium recovery stage includes: opening the forward suction pump and the manual valve, so that the high-pressure helium-nitrogen mixture in the engine cavity is recovered into the gas tank through the manual valve, the first filter, the forward suction pump and the first check valve; the first check valve prevents gas backflow, and the first filter removes impurities from the recovered gas.

9. A method for reusing and recovering helium gas in a helium leak detection test according to claim 7, characterized in that, The leak detection phase includes: closing the switch valve to isolate the engine from the helium leak detection test device that reuses and recovers helium, and then proceeding to the helium mass spectrometry leak detection stage; The computer monitors the pressure holding process using data from the gas tank pressure sensor, engine pressure sensor, first helium concentration sensor, and second helium concentration sensor to ensure stable leak detection conditions. It also provides the helium leak detection safety requirement leak rate value, and the inspection operator conducts the helium leak detection test according to the helium leak detection safety requirement leak rate value. If the leak rate is within acceptable limits, proceed to the helium recovery stage; If it fails to meet the requirements, mark the leak point, repair it, and then refill and check for leaks.

10. A method for reusing and recovering helium gas in a helium leak detection test according to claim 7, characterized in that, The reuse phase includes the following process: under the condition that the amount of helium-nitrogen mixture and the helium ratio in the gas tank meet the minimum of 10%, the process of repeated leak detection and filling phase, leak detection phase and helium recovery phase is carried out, and multiple helium leak detections are performed on the same type of engine. The return-to-factory reuse phase includes: if the amount of helium-nitrogen mixture and the helium ratio in the storage tank do not meet 10%, the helium-nitrogen mixture in the storage tank is extracted by a reverse pump and placed into other gas cylinders, which are then returned to the helium supplier for purification and reuse, thus realizing the recycling and reuse of helium resources.

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