Device and method for detecting leakage of storage bag and diaphragm in space propulsion system

Abstract

The invention provides a leak detection device and leak detection method for a storage bag and a diaphragm in a space propulsion system, the leak detection device comprises an adapter, an air guide hose, a cup cover and a cup body, one end of the adapter is hermetically connected with a test port of the space propulsion system, and the other end of the adapter is hermetically connected with the air guide hose through a locking buckle; the cup cover is fixedly connected with the cup body, a test solution is filled in the cup body, an exhaust hole and a pipe penetrating hole are formed in the cup cover, the air guide hose penetrates through the pipe penetrating hole, extends into the cup body and is immersed in the test solution, and the air guide hose is fixedly connected with the cup cover through a limiting device. According to the invention, the bubble number of the air guide hose is counted by adopting a timing method, so that the leakage rate of the storage bag and the diaphragm of the propulsion system is judged; the method can effectively and conveniently solve the problem that whether the storage bag and the diaphragm installed in the space propulsion system are leaked and broken or not, does not need to go deep into the system, is simple in detection method, is low in cost, is easy to implement, and is suitable for the leakage rate detection of the storage bags and the diaphragms of various space propulsion systems.

Description

Technical Field

[0001] The present invention relates to the technical field of spacecraft leak detection, and in particular to a storage bag and diaphragm leak detection device and a leak detection method in a space propulsion system. Background Art

[0002] In aerospace propulsion systems, there are a large number of storage bags or diaphragms used to store and isolate propellants, gases and other working fluids. If the storage bag leaks, the gas and liquid will mix. If the diaphragm ruptures or leaks prematurely, it will have a huge impact on the system function and may even cause the failure of the mission.

[0003] The existing Chinese patent with publication number CN103604568B discloses a helium mass spectrometer leak detector suction gun for spacecraft leak detection, including an external structure and an internal structure. The external structure includes a medical needle, a suction gun rod, a front chamber, a middle chamber, a rear chamber, and a suction gun handle below the three chambers, and a hose for connecting to the leak detector arranged at the lower end of the handle, which are mechanically connected in sequence. The internal structure includes a sealing rubber ring, a filter, a cylinder with a hole and a cone head, a connecting rod and a pressure regulating column arranged in sequence. The rear end of the suction gun rod and the air outlet end of the front chamber are respectively provided with a sealing rubber ring and a filter. The two sealing rubber rings are used to seal the internal structure and the external structure of the suction gun. The pressure or flow rate of the gas entering the leak detector is adjusted by the distance between the hole and the cone head. The connecting rod connects the conical cylinder with the pressure regulating column.

[0004] However, the capsule and the diaphragm are installed deep inside the system and cannot be directly measured, and the helium leak detection suction gun cannot be inserted. Therefore, the inventor believes that it is necessary to provide a capsule and diaphragm leak detection device and a leak detection method in a space propulsion system, which does not require the use of a leak detection suction gun to penetrate deep into the system, and the detection method is simple, low-cost, and easy to implement, and is suitable for the leakage rate detection of capsules and diaphragms in various space propulsion systems. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a leakage detection device and a leakage detection method for a bag and a diaphragm in a space propulsion system.

[0006] According to the present invention, a leakage detection device for a storage bag and a diaphragm in a space propulsion system comprises: an adapter, an air guide hose, a cup cover and a cup body, one end of the adapter is sealed and connected to a test port of the space propulsion system, and the other end is sealed and connected to the air guide hose through a locking buckle;

[0007] The cup cover is tightly connected to the cup body, the cup body is filled with a test solution, the cup cover is provided with an exhaust hole and a pipe hole, the air guide hose passes through the pipe hole and extends to the inside of the cup body and is immersed in the test solution, and the air guide hose is tightly connected to the cup cover via a limiting device.

[0008] Preferably, the adapter comprises a straight connector or a bendable connector, and the sealing index of the adapter connected to the test port of the space propulsion system is better than 10 -7 Pa·m 3 / s.

[0009] Preferably, the adapter and the air guide hose have an interference fit, and the sealing index of the two is better than 10 -7 Pa·m 3 / s.

[0010] Preferably, the air guide hose is made of a non-metallic, non-toxic and non-precipitating material, with a diameter within 15 mm and a length within 200 mm, and a scale is marked at the outlet of the air guide hose.

[0011] Preferably, the diameter of the tube-penetrating hole is larger than the diameter of the air-guiding hose, and the difference between the diameters of the two does not exceed 5 mm.

[0012] Preferably, the cup cover is fastened to the upper end of the cup body by threaded fitting, and the connection between the two is sealed.

[0013] Preferably, the diameters of the cup cover and the cup body are no greater than 60 mm, and a solution volume scale is provided on the surface of the cup body.

[0014] Preferably, the test solution comprises an ethanol solution, the volume of the test solution does not exceed one third of the volume of the cup body, and the outlet of the air guide hose is arranged within 2 mm below the liquid level of the test solution.

[0015] Preferably, the limiting device is arranged inside the cup cover, and the size of the limiting device is larger than the diameter of the through-tube hole, and the cup cover is suspended on the air guide hose through the limiting device.

[0016] According to a leak detection method of a capsule and diaphragm leak detection device in a space propulsion system provided by the present invention, the capsule and diaphragm leak detection device in a space propulsion system described above is used, and the method comprises the following steps:

[0017] Step M1, selecting an adapter that matches the test port of the space propulsion system;

[0018] Step M2, connecting the adapter to the air guide hose through a locking buckle;

[0019] Step M3, pour the test solution into the cup body to a preset position, extend the outlet of the air guide hose into the test solution, close the cup cover, and fix the relative position of the air guide hose and the cup cover by a limiting device;

[0020] Step M4, docking the adapter with the test port of the space propulsion system;

[0021] Step M5: Introduce helium or nitrogen into the test port upstream of the storage bag or diaphragm of the system to be tested, so that the pressure upstream of the storage bag and the diaphragm is higher than the downstream pressure. If no bubbles are generated within 5 minutes of the timing of the leak detection device, the system storage bag and the diaphragm are leak-proof. If bubbles continue to be generated in the cavity during the detection of the storage bag, the storage bag is compressed and exhausted. The device can be left to stand for 1 hour before timing and recording. If bubbles continue to be generated in the detection device after standing, monitor continuously for 15 minutes and record the number of bubbles every 5 minutes. If the number of bubbles generated every 5 minutes is within 10 bubbles and continues to decrease, it can be determined that the storage bag is leak-proof.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention is connected to the test port of the space propulsion system through an adapter, and the outlet of the gas guide hose is immersed below the liquid surface of the test solution. The number of bubbles of the gas guide hose is counted by a timing method, so as to judge the leakage rate of the storage bag and the diaphragm of the propulsion system; it can effectively and conveniently solve the problem of whether the storage bag and the diaphragm installed inside the space propulsion system have leakage and rupture, without using a leak detection suction gun to penetrate into the system, the detection method is simple, the cost is low, and the implementation is simple, which is suitable for the leakage rate detection of the storage bag and the diaphragm of various space propulsion systems.

[0024] 2. The present invention can adapt to leak detection of almost all types of systems and leak detection at any parking angle by using an adapter. The adapter is tightly connected to the gas hose by a locking buckle, so that the device can be vertically suspended on the gas hose as a whole when no external force is applied. The limit device can also be disassembled and assembled to adjust the relative depth relationship between the gas hose and the liquid level in the cup body.

[0025] 3. The present invention can quantitatively insert the depth, thereby avoiding the difference in front and back counting conditions caused by different back pressures at the bubble counting outlets caused by different insertion depths; the container can be naturally suspended at the test port without the need for long-term manual lifting of the container, thereby avoiding the situation in which the liquid surface position is different due to muscle looseness and shaking caused by manual lifting, thereby ensuring the accuracy of bubble counting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 The present invention mainly embodies the structural schematic diagram of the storage bag and diaphragm leak detection device in the space propulsion system.

[0028] As shown in the figure:

[0029] Adapter 1 Locking buckle 2 Air guide hose 3

[0030] Limiting device 4 Cup cover 5 Cup body 6

[0031] Test solution 7 Vent hole 51 Pipe hole 52 DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, a leakage detection device for a storage bag and a diaphragm in a space propulsion system provided according to the present invention comprises: an adapter 1, an air hose 3, a cup cover 5 and a cup body 6, one end of the adapter 1 is sealed and connected to the test port of the space propulsion system, and the other end is sealed and connected to the air hose 3 through a locking buckle 2; the cup cover 5 is tightly connected to the cup body 6, and a test solution 7 is filled inside the cup body 6. An exhaust hole 51 and a through-tube hole 52 are provided on the cup cover 5, and the air hose 3 extends through the through-tube hole 52 to the inside of the cup body 6 and is immersed in the test solution 7, and the air hose 3 is tightly connected to the cup cover 5 through a limiting device 4.

[0035] The adapter 1 is suitable for the test port of the space propulsion system. The adapter 1 includes a straight connector or a bendable connector, which can be adapted to the measurement of various systems and angles. The adapter 1 has good sealing performance when connected to the system, and the sealing index is better than 10 - 7 Pa·m 3 / s. The adapter 1 and the air guide hose 3 have a slight interference fit, and the sealing index of the two is better than 10 -7 Pa·m 3 / s. The locking buckle 2 can adjust the tightness and is used to connect the adapter 1 and the air hose 3, which strengthens the connection between the two and prevents them from falling off and disconnecting, while enhancing the sealing of the connection at this point, and at the same time makes the adapter 1 and the air hose 3 form a flexible connection, which is convenient for replacing adapters 1 of different specifications to adapt to the system.

[0036] The air guide hose 3 is made of a non-metallic, non-toxic and non-precipitating material. In this application, a PU hose is preferably used, with a diameter of less than 15 mm and a length of less than 200 mm. The outlet of the air guide hose 3 is marked with a scale, preferably at 2 mm. By marking the scale, the insertion depth can be quantitatively determined, thereby avoiding the different counting conditions before and after caused by different outlet back pressures of bubble counting caused by different insertion depths, thereby ensuring the accuracy of bubble counting.

[0037] The diameter of the through-tube hole 52 is larger than the diameter of the air-guiding hose 3, and the difference between the diameters of the two does not exceed 5 mm.

[0038] The cup cover 5 and the upper end of the cup body 6 are fastened and connected by threaded fit, and the connection between the two is sealed. The cup cover 5 and the cup body 6 are screwed together, which has a sealing effect and can prevent the test solution 7 from flowing out.

[0039] The diameters of the cup cover 5 and the cup body 6 are no greater than 60 mm, and a solution volume scale is provided on the surface of the cup body 6 .

[0040] The test solution 7 includes an ethanol solution. When the test solution 7 is contained, the volume of the test solution 7 does not exceed one third of the volume of the cup body 6, which can reduce the overall weight of the device and prevent the liquid from spilling onto the product due to shaking during use. The outlet of the air guide hose 3 is set within 2 mm below the liquid level of the test solution 7.

[0041] The limiting device 4 is arranged inside the cup cover 5, and the size of the limiting device 4 is larger than the diameter of the through-tube hole 52, and the cup cover 5 is suspended on the air guide hose 3 through the limiting device 4. The limiting device 4 is used to fix the air guide hose 3 and is slightly larger than the through-tube hole 52, and can be stuck on the cup cover 5, so that the device can be vertically suspended on the air guide hose 3 as a whole without external force. The limiting device 4 can also be disassembled and assembled to adjust the length of the air guide hose 3 in the cup body 6.

[0042] Generally, the test time is long, and manual lifting requires the arm to be fixed for a long time, and it is impossible to ensure that the liquid level is fixed and does not shake. If the system test port is high or inside the system, it is usually impossible for people to stand. This application can effectively solve this problem. This application can use its own structure to be vertically suspended on the system test port as a whole, and can accurately and quantitatively control the depth of the insertion of the gas hose 3. If quantitative control is not performed, the gas hose 3 is inserted too deep, and the hydraulic pressure makes it difficult to discharge bubbles. If it is too shallow, the outlet of the gas hose 3 is exposed to the liquid surface, making the test invalid.

[0043] The present application is applicable to a variety of adapters 1, and can adapt to leak detection of almost all types of systems and leak detection at any parking angle. Select a suitable adapter 1 to connect with the test port of the product, immerse the outlet of the gas hose 3 below the liquid level of the test solution 7, and use the timing method to count the number of bubbles of the gas hose 3, so as to determine the leakage rate of the propulsion system capsule and diaphragm. It can effectively and conveniently solve the problem of whether there are leaks and ruptures in the capsule and diaphragm installed inside the space propulsion system, without the need to use a leak detection suction gun to go deep into the system. The detection method of the present application is simple, low-cost, and simple to implement, and is suitable for the leakage rate detection of capsules and diaphragms of various space propulsion systems.

[0044] Example 2

[0045] Based on Example 1, a leak detection method for a capsule and diaphragm leak detection device in a space propulsion system provided by the present invention, using the capsule and diaphragm leak detection device in a space propulsion system of Example 1, comprises the following steps:

[0046] Step M1, selecting an adapter 1 that matches the test port of the space propulsion system;

[0047] Step M2, connecting the adapter 1 to the air guide hose 3 through the locking buckle 2;

[0048] Step M3, pour the test solution 7 into the cup body 6 to the 1 / 3 scale position, extend the outlet of the air guide hose 3 to within 2 mm below the liquid level of the test solution 7, close the cup cover 5, and fix the relative position of the air guide hose 3 and the cup cover 5 by the limit device 4;

[0049] Step M4, docking the adapter 1 with the test port of the space propulsion system, and naturally suspending the entire leak detection device on the test port of the system through the air guide hose 3, the limit device 4, and the cup cover 5;

[0050] Step M5: Introduce 0.2MPa helium or nitrogen into the test port upstream of the storage bag or diaphragm of the system to be tested, so that the pressure upstream of the storage bag and the diaphragm is higher than the downstream pressure. If no bubbles are generated within 5 minutes of the timing of the leak detection device, the system storage bag and the diaphragm are leak-proof. If bubbles continue to be generated in the cavity during the detection of the storage bag, the storage bag is compressed and exhausted. It can be allowed to stand for 1 hour before timing and recording. If bubbles continue to be generated in the detection device after standing, continue monitoring for 15 minutes and record the number of bubbles every 5 minutes. If the number of bubbles generated every 5 minutes is within 10 bubbles and continues to decrease, it can be determined that the storage bag is leak-proof.

[0051] The storage bag and the diaphragm in the propulsion system can use the pressure difference between the front and the back to introduce the downstream into the solution, and judge whether it is leaking by whether bubbles are generated. The number of bubbles generated within a limited time is counted to judge the degree of leakage. The present application can use its own structure to be suspended vertically on the system test port as a whole, and can accurately control the depth of insertion of the gas hose 3, so that the gas hose 3 is not inserted too deep, the hydraulic pressure makes it difficult to discharge bubbles, and the shallow outlet of the gas hose 3 is exposed to the liquid surface, making the test invalid. At the same time, no manual lifting is required during the test, and a small operating space can be used.

[0052] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are 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.

[0053] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A leakage detection device for a capsule and a diaphragm in a space propulsion system, characterized in that: include: An adapter (1), an air guide hose (3), a cup cover (5) and a cup body (6), wherein one end of the adapter (1) is sealedly connected to a test port of a space propulsion system, and the other end is sealedly connected to the air guide hose (3) via a locking buckle (2); The cup cover (5) is tightly connected to the cup body (6), the cup body (6) contains a test solution (7), the cup cover (5) is provided with an exhaust hole (51) and a pipe hole (52), the air guide hose (3) passes through the pipe hole (52) and extends into the cup body (6) and is immersed in the test solution (7), and the air guide hose (3) is tightly connected to the cup cover (5) via a limiting device (4).

2. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The adapter (1) comprises a straight connector or a bendable connector, and the sealing index of the adapter (1) connected to the test port of the space propulsion system is better than 10. -7 Pa·m 3 / s.

3. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The adapter (1) and the air guide hose (3) are interference fit, and the sealing index of the two is better than 10. -7 Pa·m 3 / s.

4. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The air guide hose (3) is made of a non-metallic, non-toxic and non-precipitating material, has a diameter within 15 mm and a length within 200 mm, and the outlet of the air guide hose (3) is marked with a scale.

5. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The diameter of the tube-penetrating hole (52) is greater than the diameter of the air-guiding hose (3), and the difference between the diameters of the two does not exceed 5 mm.

6. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The cup cover (5) is fastened to the upper end of the cup body (6) through threaded fitting, and the connection between the two is sealed.

7. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The diameters of the cup cover (5) and the cup body (6) are no greater than 60 mm, and a solution volume scale is provided on the surface of the cup body (6).

8. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The test solution (7) comprises an ethanol solution, the volume of the test solution (7) does not exceed one third of the volume of the cup body (6), and the outlet of the air guide hose (3) is arranged within 2 mm below the liquid level of the test solution (7).

9. The capsule and diaphragm leak detection device in a space propulsion system as claimed in claim 1, characterized in that: The limiting device (4) is arranged inside the cup cover (5), and the size of the limiting device (4) is larger than the diameter of the tube hole (52), and the cup cover (5) is suspended on the air guide hose (3) through the limiting device (4).

10. A method for leak detection of a capsule and diaphragm leak detection device in a space propulsion system, characterized in that: The device for detecting leakage of a capsule and a diaphragm in a space propulsion system according to any one of claims 1 to 9 comprises the following steps: Step M1, selecting an adapter (1) that matches the test port of the space propulsion system; Step M2, connecting the adapter (1) to the air guide hose (3) via the locking buckle (2); Step M3, pouring the test solution (7) into the cup body (6) to a preset position, extending the outlet of the air guide hose (3) into the test solution (7), closing the cup cover (5), and fixing the relative position of the air guide hose (3) and the cup cover (5) by the limiting device (4); Step M4, docking the adapter (1) with the test port of the space propulsion system; Step M5: Introduce helium or nitrogen into the test port upstream of the storage bag or diaphragm of the system to be tested, so that the pressure upstream of the storage bag and the diaphragm is higher than the downstream pressure. If no bubbles are generated within 5 minutes of the timing of the leak detection device, the system storage bag and the diaphragm are leak-proof. If bubbles continue to be generated in the cavity during the detection of the storage bag, the storage bag is compressed and exhausted. The device can be left to stand for 1 hour before timing and recording. If bubbles continue to be generated in the detection device after standing, monitor continuously for 15 minutes and record the number of bubbles every 5 minutes. If the number of bubbles generated every 5 minutes is within 10 bubbles and continues to decrease, it can be determined that the storage bag is leak-proof.

Images