Airtight leak detection tool and airtight leak detection method for airspace engine

Abstract

The invention relates to the field of airspace engine airtightness leakage detection, in particular to an airspace engine airtightness leakage detection tool. Comprising a stay bolt, two fixing nuts screwed on the front section of the stay bolt, a fixing bottom plate arranged on the front section of the stay bolt in a penetrating mode and clamped between the two fixing nuts, a sealing pressing disc arranged on the middle section of the stay bolt in a penetrating mode, and a sealing pressing disc O-shaped sealing ring arranged on the circumferential side face of the sealing pressing disc in a sleeving mode. The sealing compression nut is screwed on the rear section of the stay bolt, and the sealing compression end of the sealing compression nut can be sleeved on the middle section of the stay bolt; the compression nut O-shaped sealing ring is sleeved on the stay bolt and is positioned between the sealing pressure plate and the sealing compression nut; and the airtight pipe joint is arranged in an airtight detection mounting hole of the sealing pressure plate. According to the invention, the airspace engine airtightness leak detection effect is good, the detection effect is obvious, the operation difficulty of the airtightness leak detection work is low, and the airspace engine airtightness leak detection device is also suitable for airtightness leak detection of airspace engines with different throat sizes.

Description

Technical Field

[0001] The present application relates to the field of aerospace engine airtight leak detection, and in particular to an aerospace engine airtight leak detection tool and an airtight leak detection method. Background Art

[0002] When a space engine is working, high-pressure gas and fuel flow inside. If the seal is not tight and leakage occurs, it will lead to unstable pressure, affect the supply ratio of fuel and oxidizer, cause insufficient engine thrust or abnormal operation, and may even cause the engine to shut down mid-flight, posing a serious threat to the safety of spacecraft and astronauts, and making the space mission impossible to complete.

[0003] To ensure the safety of spacecraft and astronauts, and thus the successful completion of space missions, aerospace engines are typically tested for leaks. Currently, in most cases, this is done using silicone plugs. This requires external force to push the silicone plug against the engine's throat, which is difficult to operate, results in small gas leaks, poor airtightness, and ineffective detection of leaks, resulting in insignificant inspection results.

[0004] Therefore, how to make the airtightness leak detection of aerospace engines more effective, the inspection effect more significant, and reduce the operational difficulty of the airtightness leak detection work is a technical problem that technicians in this field urgently need to solve. Summary of the Invention

[0005] The present application provides an aerospace engine airtight leak detection tool, which can achieve better airtight leak detection results for aerospace engines, with significant inspection results, and makes the airtight leak detection work less difficult to operate. It can also be used for airtight leak detection of aerospace engines with different throat sizes, especially for airtight leak detection of aerospace engines with sizes ranging from 150mm to 240mm.

[0006] To solve the above technical problems, this application provides the following technical solutions:

[0007] The O-ring of the compression nut is sleeved on the tie rod bolt and is located between the sealing pressure plate and the sealing pressure nut; the airtight pipe joint is installed in the airtight detection installation hole of the sealing pressure plate for connecting the detection pipeline.

[0008] As described above, in the aerospace engine airtight leak detection tool, preferably, the front section of the tie rod bolt is a screw rod with a certain length; the middle section of the tie rod bolt is a polished rod; the front part of the rear section of the tie rod bolt is a screw rod for cooperating with the threaded connection end of the sealing compression nut; the middle part of the rear section of the tie rod bolt is a hexagonal rod; and the rear part of the rear section of the tie rod bolt is a polished rod.

[0009] As described above, in the aerospace engine airtight leak detection tool, preferably, the fixed base plate has two opposite sets of side surfaces, one set of side surfaces being conical side surfaces and the other set of side surfaces being flat side surfaces, and the conical side surfaces are used to contact and cooperate with the inner side surfaces of the engine throat.

[0010] In the aerospace engine airtight leak detection tool as described above, preferably, the circumferential side surface of the sealing pressure plate has an inwardly concave sealing groove for accommodating the sealing pressure plate O-ring, and a portion of the sealing pressure plate O-ring protrudes from the sealing groove.

[0011] As described above, in the aerospace engine airtight leak detection tool, preferably, the portion of the circumferential side surface of the sealing pressure plate located in front of the sealing groove is a conical side surface, and the portion of the circumferential side surface of the sealing pressure plate located in rear of the sealing groove is a columnar side surface.

[0012] As described above, in the aerospace engine airtight leak detection tool, preferably, the diameter of the sealing pressure plate is 250 mm and the thickness is 20 mm; the diameter of the sealing groove is 10 mm and the depth is 5 mm; the outer diameter of the sealing pressure plate O-ring is 256 mm, the inner diameter is 236 mm, and the wire diameter is 10 mm.

[0013] As described above, in the aerospace engine airtight leak detection tooling, preferably, the middle of the sealing pressure plate has a middle hole that passes through the front and rear ends, which is used to be inserted into the middle section of the pull rod bolt and to be gap-fitted with the middle section of the pull rod bolt; the sealing pressure plate has a leak detection mounting hole that passes through the front and rear ends.

[0014] In the aerospace engine airtight leak detection tool as described above, preferably, the portion of the middle hole near the rear end forms a middle hole sealing groove with a diameter larger than the diameter of the middle hole, which is used to accommodate the tightening nut O-ring.

[0015] In the aerospace engine airtight leak detection tool as described above, preferably, the sealing and pressing end of the sealing and pressing nut has an inner hole, and the inner hole can be sleeved to the middle section of the pull rod bolt.

[0016] A method for detecting airtightness of an aerospace engine, characterized in that it uses any of the above-mentioned aerospace engine airtightness detection tools, comprising the following steps: screwing a first fixing nut into the front section of a tie rod bolt; inserting a fixing base plate into the front section of the tie rod bolt; screwing a second fixing nut into the front section of the tie rod bolt, so that the first fixing nut and the second fixing nut are clamped to the fixing base plate; placing the assembled tie rod bolt and the fixing base plate into the inner side of the throat of the engine thrust chamber, and making the tapered side surface of the fixing base plate fit with the inner side surface of the throat; installing the airtight pipe joint Install it in the leak detection mounting hole of the sealing pressure plate; insert the sealing pressure plate into the middle section of the tie rod bolt, and install the sealing pressure plate O-ring to the circumferential side of the sealing pressure plate; install the clamping nut O-ring to the tie rod bolt; screw the sealing clamping nut into the rear section of the tie rod bolt, and make the sealing clamping end of the sealing clamping nut sleeve to the middle section of the tie rod bolt, and squeeze the sealing pressure plate until the sealing pressure plate O-ring is compressed between the sealing pressure plate and the nozzle surface outside the engine throat; connect the airtight pipe joint to the detection pipeline to perform airtightness detection.

[0017] Compared with the above-mentioned background technology, the aerospace engine airtight leak detection tooling provided by the present application can achieve better airtight leak detection results for aerospace engines, with significant inspection results, and make the operation of airtight leak detection work less difficult. It can also be used for airtight leak detection of aerospace engines with different throat sizes, especially for airtight leak detection of aerospace engines with sizes ranging from 150mm to 240mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the aerospace engine airtight leak detection tooling of the present application;

[0020] Figure 2 This is a schematic diagram of the tie rod bolt of the aerospace engine airtight leak detection tooling of the present application;

[0021] Figure 3 This is a schematic diagram of a fixing nut of the aerospace engine airtight leak detection tooling of the present application;

[0022] Figure 4 This is a schematic diagram of the fixed base plate of the aerospace engine airtight leak detection tooling of the present application;

[0023] Figure 5 Schematic diagram of the sealing pressure plate of the aerospace engine airtight leak detection tooling of the present application;

[0024] Figure 6 is a cross-sectional view of the sealing pressure plate of the aerospace engine airtight leak detection tooling of the present application;

[0025] Figure 7 Schematic diagram of the O-ring of the sealing pressure plate of the aerospace engine airtight leak detection tooling of the present application;

[0026] Figure 8 Schematic diagram of the sealing compression nut of the aerospace engine airtight leak detection tool of the present application;

[0027] Figure 9 Schematic diagram of the compression nut and O-ring of the aerospace engine airtight leak detection tooling of the present application;

[0028] Figure 10 This is a schematic diagram of a hose connector and a hose of the aerospace engine airtight leak detection tooling of the present application;

[0029] Figure 11 This is a schematic diagram of the installation process of the aerospace engine airtight leak detection tooling of the present application;

[0030] Figure 12 This is a schematic diagram of the aerospace engine airtight leak detection tooling of the present application after installation. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] like Figure 1As shown, the present application provides an aerospace engine airtight leak detection tool, comprising: a tie rod bolt 1, a fixing nut 2, a fixing base plate 3, a sealing pressure plate 4, a sealing pressure plate O-ring 5, a compression nut O-ring 6, a sealing compression nut 7, and an airtight pipe joint 8. The tie rod bolt 1, fixing nut 2, fixing base plate 3, sealing pressure plate 4, and sealing compression nut 7 can all be made of aluminum alloy 6061; the airtight pipe joint 8 can be made of stainless steel 1Cr18Ni9Ti; and the sealing pressure plate O-ring 5 and the compression nut O-ring 6 can both be nitrile rings.

[0033] Two fixing nuts 2 are screwed on the front section of the tie rod bolt 1, and the fixing base plate 3 is passed through the front section of the tie rod bolt 1, and the fixing base plate 3 is located between the two fixing nuts 2 and is clamped by the two fixing nuts 2; the sealing pressure plate 4 is passed through the middle section of the tie rod bolt 1, and the sealing pressure plate O-type sealing ring 5 is sleeved on the circumferential side of the sealing pressure plate 4, and the sealing pressure plate O-type sealing ring 5 partially protrudes from the circumferential side of the sealing pressure plate 4, which is used to seal between the sealing pressure plate 4 and the nozzle surface outside the engine throat; the sealing compression nut 7 is screwed on the tie rod bolt The rear section of the bolt 1, and the sealing and pressing end of the sealing and pressing nut 7 can be sleeved onto the middle section of the pull rod bolt 1 to squeeze the sealing pressure plate 4 forward so that the sealing pressure plate O-ring 5 is pressed between the sealing pressure plate 4 and the nozzle surface outside the engine throat; the tightening nut O-ring 6 is sleeved on the pull rod bolt 1 and is located between the sealing pressure plate 4 and the sealing and pressing nut 7, and is used to seal between the sealing pressure plate 4 and the sealing and pressing nut 7; the airtight pipe joint 8 is installed in the airtight detection installation hole of the sealing pressure plate 4 for connecting the detection pipeline.

[0034] The detection pipeline includes: a hose connector 9 and a hose 10; the hose connector 9 is connected to the airtight pipe connector 8, and the hose 10 is connected to the hose connector 9. Optionally, the hose connector 9 can be made of stainless steel 1Cr18Ni9Ti.

[0035] like Figure 2As shown, the front section 11 of the tie rod bolt 1 is a screw with a certain length. Optionally, the front section 11 of the tie rod bolt 1 is a screw with a thread of M18x1.5 and a length of 80 mm, wherein the length of the front section 11 of the tie rod bolt 1 is 80 mm. The positions of the two fixing nuts 2 can be adjusted by a certain length of the front section 11 of the tie rod bolt 1, thereby adjusting the position of the fixed base plate 3, so that the distance between the fixed base plate 3 and the sealing pressure plate 4 can be adjusted, thereby making it suitable for engines with different sizes of nozzles. The middle section 12 of the tie rod bolt 1 is a smooth rod, which is used to cooperate with the sealing pressure plate 4 for sealing. Optionally, the middle section 12 of the tie rod bolt 1 is a smooth rod with a diameter of 20 mm. The front portion 131 of the rear section 13 of the tie rod bolt 1 is a screw rod, which is used to cooperate with the threaded connection end of the sealing and pressing nut 7. The sealing and pressing nut 7 can be turned to tighten the sealing pressure plate 4; the middle portion 132 of the rear section 13 of the tie rod bolt 1 is a hexagonal rod, which is used to clamp the hexagonal rod with a clamping tool (such as a wrench) when the sealing and pressing nut 7 is screwed in, thereby preventing the tie rod bolt 1 from rotating with the sealing and pressing nut 7; the rear portion 133 of the rear section 13 of the tie rod bolt 1 is a smooth rod, which serves as a handle during installation. Optionally, the front portion 131 of the rear section 13 of the tie rod bolt 1 is a screw rod with a thread of M18x1.5, and the rear portion 133 of the rear section 13 of the tie rod bolt 1 is a smooth rod with a diameter of 16 mm.

[0036] like Figure 3 As shown, the thread of the fixing nut 2 is an internal thread of M18x1.5 to match the thread of the front section 11 of the pull rod bolt 1; the thickness of the fixing nut 2 is 14 mm.

[0037] like Figure 4 As shown, the fixed base plate 3 has two opposing side surfaces, one of which is tapered and the other is flat. This gives the fixed base plate 3 a rectangular parallelepiped shape. This allows the tapered side surfaces of the fixed base plate 3 to contact and mate with the inner surface of the engine throat. Providing the fixed base plate 3 with flat sides (e.g., by cutting the flat sides) reduces the width of the fixed base plate 3, making it easier to place the fixed base plate 3 inside the engine thrust chamber throat. Optionally, the tapered side surfaces of the fixed base plate 3 have a taper of 58°. Alternatively, the outer diameter of the tapered side surfaces of the fixed base plate 3 is 250 mm, the width between the two flat sides of the fixed base plate 3 is 120 mm, and the thickness of the fixed base plate 3 is 8 mm. A fixed base plate mounting hole 31 is provided in the center of the fixed base plate 3, extending through the front and rear ends. This hole is intended to be inserted into the front section 11 of the tie rod bolt 1, with the smaller end of the tapered side of the fixed base plate 3 facing rearward and the larger end of the tapered side of the fixed base plate 3 facing forward. Optionally, the diameter of the fixed base plate mounting hole 31 is 20 mm.

[0038] like Figure 5 and Figure 6As shown, the circumferential side surface of the sealing pressure plate 4 has an inwardly concave sealing groove 41 for accommodating the sealing pressure plate O-ring 5, with a portion of the sealing pressure plate O-ring 5 protruding from the sealing groove 41. Optionally, the portion of the circumferential side surface of the sealing pressure plate 4 located in front of the sealing groove 41 is a conical side surface, and the portion of the circumferential side surface of the sealing pressure plate 4 located behind the sealing groove 41 is a cylindrical side surface. Optionally, the diameter of the sealing pressure plate 4 is 250 mm and the thickness is 20 mm. Alternatively, the diameter of the sealing groove 41 is 10 mm, and the depth of the sealing groove 41 is 5 mm, which is half the diameter of the sealing plate O-ring 5. That is, the diameter of the notch on the front side of the sealing groove 41 is 240 mm, and the diameter of the notch on the rear side of the sealing groove 41 is 250 mm. This avoids interference with the tapered nozzle of the engine, while ensuring sufficient compression of the sealing plate O-ring 5 and ensuring that the sealing plate O-ring 5 does not fall out of the sealing groove 41 when pressed. Alternatively, the taper of the conical side surface on the front side of the sealing groove 41 is 60°.

[0039] In addition, the middle of the sealing pressure plate 4 has a middle hole 42 that passes through the front and rear ends, which is used to pass through the middle section 12 of the pull rod bolt 1 and to be loosely matched with the middle section 12 of the pull rod bolt 1. Optionally, the diameter of the middle hole 42 is 20.5 mm, so as to be loosely matched with the middle section 12 of the pull rod bolt 1 with a diameter of 20 mm. The part of the middle hole 42 near the rear end forms a middle hole sealing groove with a diameter larger than the diameter of the middle hole 42, which is used to accommodate the clamping nut O-ring 6. Optionally, the diameter of the middle hole sealing groove is 26 mm, and the depth of the middle hole sealing groove is 2.8 mm. The sealing pressure plate 4 also has a leak detection mounting hole 43 that passes through the front and rear ends, which is used to install the airtight pipe joint 8. Optionally, the leak detection mounting hole 43 on the sealing pressure plate 4 is an RC1 / 4 threaded hole, where RC represents a conical internal thread and 1 / 4 represents the nominal size of the thread.

[0040] In addition, the front end of the sealing plate 4 has a backward concave groove 44, which can reduce the weight of the sealing plate 4 while ensuring the strength of the sealing plate 4. Optionally, the diameter of the groove 44 is 200mm and the depth is 10mm.

[0041] like Figure 7As shown, the sealing pressure plate O-ring 5 is installed in the sealing groove 41. Optionally, the outer diameter of the sealing pressure plate O-ring 5 is 256mm, the inner diameter is 236mm, and the wire diameter is 10mm. A sealing ring with a wire diameter of 10mm is selected and installed in the sealing groove 41 of the sealing pressure plate 4 with an outer diameter of 250mm. After the sealing pressure nut 7 is tightened to a torque of 8N.m to 10N.m, the linear sealing dimension between the sealing pressure plate O-ring 5 and the nozzle surface outside the engine throat reaches 2mm. If a sealing ring with a diameter less than 10mm is selected, the linear sealing dimension will be too small and the sealing performance will be worse; if a sealing ring with a diameter greater than 10mm is selected, the size of the sealing pressure plate 4 needs to be thickened, which makes the weight of the entire tooling heavier and loses its portability.

[0042] like Figure 8 As shown, the sealing and pressing end of the sealing and pressing nut 7 has an inner hole 71, which can be inserted into the middle section 12 of the tie rod bolt 1. By providing the inner hole 71, a certain amount of adjustment can be ensured in the sealing position of the sealing pressure plate 4 on the tie rod bolt 1. Optionally, the inner hole 71 of the sealing and pressing nut 7 has a depth of 10 mm and a diameter of 20 mm. The diameter of the inner hole 71 of 20 mm is equal to the diameter of the middle section 12 of the tie rod bolt 1, which can ensure that the inner hole 71 is inserted into the middle section 12 of the tie rod bolt 1. In addition, the depth of the inner hole 71 is 10 mm, which can also ensure that the sealing position of the sealing pressure plate 4 on the tie rod bolt 1 can be adjusted by 10 mm, thereby ensuring that it can adapt to engines with different nozzle sizes. Optionally, the threaded connection end of the sealing and pressing nut 7 has an internal thread with an M18x1.5 thread to match the front part of the rear section 13 of the tie rod bolt 1.

[0043] like Figure 9 As shown, the compression nut O-ring 6 is positioned within the sealing groove in the center hole of the sealing plate 4. Optionally, the compression nut O-ring 6 has an outer diameter of 26 mm, an inner diameter of 19.8 mm, and a wire diameter of 3.1 mm, designed to fit within the 26 mm diameter center hole sealing groove. Pressure from the sealing compression nut 7 creates a 0.3 mm compression of the compression nut O-ring 6 in the planar direction, while simultaneously providing a tight seal against the tie rod bolt 1 along the inner diameter of the seal.

[0044] like Figure 10 As shown, the hose connector 9 is a DN6, 60° ball joint, which is connected to the airtight pipe connector 8 and to the hose 10 .

[0045] like Figure 11 and Figure 12 As shown, instructions for use and working principle:

[0046] The first step is to screw the first fixing nut 2 into the front section 11 of the tie rod bolt 1;

[0047] The second step is to insert the fixed base plate 3 into the front section 11 of the pull rod bolt 1;

[0048] Step 3: Screw the second fixing nut 2 into the front section 11 of the pull rod bolt 1, and clamp the first fixing nut 2 and the second fixing nut 2 to the fixed base plate;

[0049] The fourth step is to place the assembled pull rod bolt 1 and fixed base plate 3 assembly into the inner side of the engine thrust chamber throat, and make the tapered side surface of the fixed base plate 3 fit with the inner side surface of the throat;

[0050] Step 5: Install the airtight pipe joint 8 into the leak detection installation hole 43 of the sealing pressure plate 4;

[0051] Step 6: Insert the sealing pressure plate 4 into the middle section 12 of the tie rod bolt 1, and install the sealing pressure plate O-ring 5 to the circumferential side surface of the sealing pressure plate (for example, the sealing groove 41);

[0052] Step 7: Install the compression nut O-ring 6 onto the tie rod bolt;

[0053] Specifically, the compression nut O-ring 6 can be installed in the sealing groove of the middle hole of the sealing pressure plate 4.

[0054] Step 8: Screw the sealing compression nut 7 into the rear section 13 of the tie rod bolt 1, and make the sealing compression end of the sealing compression nut 7 cover the middle section 12 of the tie rod bolt 1, thereby squeezing the sealing pressure plate 4 until the sealing pressure plate O-ring 5 is compressed between the sealing pressure plate and the nozzle surface outside the engine throat;

[0055] Specifically, the torque between the sealing pressure plate O-ring 5 and the nozzle surface outside the engine throat can be tightened to between 8N.M and 10N.m.

[0056] Step 9: Connect the airtight pipe joint to the test pipe and perform airtight test;

[0057] Specifically, the hose connector 9 is connected to the airtight pipe connector 8, and the hose 10 is connected to the hose connector 9, and then an airtightness test is performed.

[0058] Insert the hose 10 into a measuring cup filled with alcohol and use the bubble method to test for airtightness. If there is any gas leakage, the alcohol in the measuring cup will bubble (bubble leak detection method). Connect the hose 10 to a gas flow meter and use the gas flow meter detection method to measure the amount of gas leakage through the gas flow meter float.

[0059] Working Principle: Install the aerospace engine airtightness test fixture according to the above steps. The fixed base plate 3 is fixed using the conical surface inside the engine throat. The sealing pressure plate 4 is sealed using the conical surface outside the engine throat. If there is gas leakage in the engine's oxygen main valve, combustion main valve, and other pipes connected to the thrust chamber, the gas will enter the thrust chamber and be discharged through the hose connector 9 and hose 10 connected to the airtight pipe connector 8 on the sealing pressure plate 4. The hose can be placed in a measuring cup filled with alcohol and tested using the bubble method to observe whether the alcohol in the measuring cup bubbles. The hose 10 can also be connected to a gas flow meter for airtightness testing using the gas flow meter detection method. The amount of gas leakage can be measured by the gas flow meter float.

[0060] The aerospace engine airtight leak detection tool provided in the present application can achieve better airtight leak detection results for aerospace engines, with significant inspection results, and reduce the operational difficulty of airtight leak detection work. In addition, it can also be suitable for airtight leak detection of aerospace engines with different throat sizes, especially for airtight leak detection of aerospace engines with throat sizes ranging from 150mm to 240mm.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0062] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An aerospace engine airtight leak detection tool, characterized in that: include: Tie rod bolts, fixing nuts, fixing base plate, sealing pressure plate, sealing pressure plate O-ring, compression nut O-ring, sealing compression nut and airtight pipe joint; Two fixing nuts are screwed on the front section of the tie rod bolt, and the fixed base plate is passed through the front section of the tie rod bolt and is clamped between the two fixing nuts; the sealing pressure plate is passed through the middle section of the tie rod bolt, and the sealing pressure plate O-ring is sleeved on the circumferential side of the sealing pressure plate, and its part protrudes from the circumferential side of the sealing pressure plate; the sealing clamping nut is screwed on the rear section of the tie rod bolt, and its sealing clamping end can be sleeved to the middle section of the tie rod bolt to squeeze the sealing pressure plate forward so that the sealing pressure plate O-ring is compressed between the sealing pressure plate and the nozzle surface outside the engine throat; the clamping nut O-ring is sleeved on the tie rod bolt and is located between the sealing pressure plate and the sealing clamping nut; the airtight pipe joint is installed in the airtight detection mounting hole of the sealing pressure plate for connecting the detection pipeline.

2. The aerospace engine airtight leak detection tool according to claim 1, characterized in that: The front section of the tie rod bolt is a screw rod with a certain length; the middle section of the tie rod bolt is a polished rod; The front part of the rear section of the pull rod bolt is a screw rod, which is used to cooperate with the threaded connection end of the sealing compression nut; the middle part of the rear section of the pull rod bolt is a hexagonal rod; and the rear part of the rear section of the pull rod bolt is a polished rod.

3. The aerospace engine airtight leak detection tool according to claim 1, characterized in that: The fixed base plate has two opposite side surfaces, one of which is a tapered side surface and the other is a flat side surface. The tapered side surfaces are used for contacting and matching with the inner side surfaces of the engine throat.

4. The aerospace engine airtight leak detection tool according to any one of claims 1 to 3, characterized in that: The circumferential side surface of the sealing pressure plate is provided with an inwardly concave sealing groove for accommodating the sealing pressure plate O-type sealing ring, and a portion of the sealing pressure plate O-type sealing ring protrudes out of the sealing groove.

5. The aerospace engine airtight leak detection tool according to claim 4, characterized in that: The portion of the circumferential side surface of the sealing pressure plate located in front of the sealing groove is a cone side surface, and the portion of the circumferential side surface of the sealing pressure plate located in rear of the sealing groove is a column side surface.

6. The aerospace engine airtight leak detection tool according to claim 4, characterized in that: The diameter of the sealing plate is 250mm and the thickness is 20mm; The diameter of the sealing groove is 10 mm and the depth is 5 mm; The outer diameter of the O-ring of the sealing pressure plate is 256mm, the inner diameter is 236mm, and the wire diameter is 10mm.

7. The aerospace engine airtight leak detection tool according to any one of claims 1 to 3, characterized in that: The middle of the sealing pressure plate has a middle hole that passes through the front and rear ends, which is used to pass through the middle section of the pull rod bolt and has a clearance fit with the middle section of the pull rod bolt; The sealing pressure plate is provided with a leak detection installation hole which passes through the front and rear ends.

8. The aerospace engine airtight leak detection tool according to claim 7, characterized in that: A portion of the middle hole close to the rear end forms a middle hole sealing groove with a diameter larger than that of the middle hole, which is used to accommodate a compression nut O-type sealing ring.

9. The aerospace engine airtight leak detection tool according to any one of claims 1 to 3, characterized in that: The sealing compression end of the sealing compression nut is provided with an inner hole, and the inner hole can be sleeved to the middle section of the pull rod bolt.

10. A method for leak detection of an aerospace engine, characterized in that: The application of the aerospace engine airtight leak detection tool according to any one of claims 1 to 9 comprises the following steps: Screw the first fixing nut into the front section of the stay bolt; Insert the fixed base plate into the front section of the pull rod bolt; Screw the second fixing nut into the front end of the tie rod bolt so that the first fixing nut and the second fixing nut are clamped to the fixed base plate; Place the assembled tie rod bolts and fixing base plate into the inner side of the engine thrust chamber throat, and make the tapered side of the fixing base plate fit in with the inner side of the throat; Install the airtight pipe joint into the leak detection installation hole of the sealing pressure plate; Insert the sealing pressure plate into the middle section of the tie rod bolt, and install the sealing pressure plate O-ring to the circumferential side of the sealing pressure plate; Install the compression nut O-ring onto the tie rod bolt; Screw the sealing compression nut into the rear section of the tie rod bolt, and make the sealing compression end of the sealing compression nut cover the middle section of the tie rod bolt, and squeeze the sealing pressure plate until the sealing pressure plate O-ring is pressed tightly between the sealing pressure plate and the nozzle surface outside the engine throat; Connect the airtight pipe joint to the test pipeline and perform airtight testing.

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