Booster rocket engine blanking cap threading hole sealing device

Abstract

According to the booster rocket engine plug cover threading hole sealing device, the sealing plug is installed in an installation hole of the plug G, the plug M and the plug G are screwed, the sealing plug is extruded to deform, and fastening and sealing are achieved. The operation degree is high, and the operability is greatly improved; the overall appearance quality of the boosting engine is improved; the risk of air leakage is greatly reduced; the material adaptability is high; the product reliability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of structural sealing, and specifically to a method for sealing threading holes in a plugging cover of a booster rocket engine. Background Art

[0002] Booster rocket engines are mostly used for target drone launches. Currently, most booster rocket engines are post-ignited, which involves leading out the ignition wire from the nozzle plug. Most booster rocket engine plugs are external structures. The sealing of the plug threading holes has a great impact on the reliability of the overall product. If the sealing is not good or there is leakage, the propellant inside the booster engine will be damp during use or long-term storage, which will cause the performance of the booster rocket engine to fail to meet the standards or even the product to be scrapped. At present, the threading holes of the external aluminum plugs are mainly sealed by applying D03 putty. Disadvantages of the putty sealing method:

[0003] a. It is not easy to operate during sealing and is affected by the operator's proficiency;

[0004] b. Due to the characteristics of D03 putty, it is difficult to apply during use, resulting in poor product appearance quality and requiring multiple cleanings;

[0005] c. Improper operation, easy to leak after long-term storage;

[0006] d.Depending on the different operating conditions of the booster engine (high temperature, low temperature), it is easy to fall off during long-term storage. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the present invention provides a sealing device for the threading hole of a booster rocket engine plugging cover. In view of the shortcomings and disadvantages of the existing methods for threading holes of external aluminum plugging covers, the present invention is aimed at the threading holes of external aluminum plugging covers of booster rockets, and the sealing device is intended to achieve the following purposes:

[0008] a. Easy to operate and install without being affected by human factors;

[0009] b. After installation, the overall appearance of the product will not be affected and the sealing performance meets the technical requirements of the product;

[0010] c. The newly designed sealing structure ensures that the product does not leak during use;

[0011] d. It will not fall off, age or corrode during long-term storage and will not be affected by temperature.

[0012] The technical solution adopted by the present invention to solve the technical problem is:

[0013] A sealing device for a threading hole of a booster rocket engine plug cover comprises a plug M, a sealing plug and a plug G. The sealing plug is installed in the installation hole of the plug G. The plug M and the plug G are screwed and the sealing plug is squeezed to deform, so as to achieve fastening and sealing.

[0014] It also includes a sealing ring, which is located in a sealing groove on the outer edge of the plug G.

[0015] The plug M and the plug G are connected by threads, and the material of the plug M and the plug G is engineering plastic;

[0016] There are through holes in the center of plug M, sealing plug and plug G to ensure that the cables can pass through smoothly. The diameter of the through hole is 1.05 times the sum of the cable diameters.

[0017] A through hole is provided at the center of the nozzle plugging cover of the engine, and the diameter of the through hole of the nozzle plugging cover is 1.05 times the diameter of the G thread of the plug;

[0018] The sealing plug is made of silicone material to ensure sufficient compression;

[0019] Plug G is a screw structure, and the nut adopts a hexagonal design.

[0020] The inner cavity of the head of the plug M is a nut semi-enclosed structure, which serves as a mounting hole for the sealing plug; the outer surface of the plug M is a hexagonal nut structure for easy installation.

[0021] The sealing plug is in the shape of a truncated cone, and the diameter of the upper bottom surface of the truncated cone is 0.75 to 0.85 times the diameter of the through hole of the plug G, which is convenient for center alignment and improves installation efficiency. The diameter of the lower bottom surface of the truncated cone is 1.15 to 1.25 times the diameter of the through hole of the plug G. The height of the sealing plug is 0.1 mm to 0.2 mm higher than the length of the through hole of the plug G, which is convenient for the plug M to completely squeeze the sealing plug into the installation hole of the plug G and ensure that the sealing plug is effectively deformed to squeeze the cable;

[0022] A sealing groove is provided on the outer edge of the plug G, and a sealing ring is installed in the sealing groove. The material of the sealing ring is nitrile rubber to meet the compression amount. The size of the sealing ring is based on the actual size of the sealing groove of the plug G. The specific selection of the sealing ring refers to the sealing plane rectangular groove sealing structure in QJ2748A-2004 "General Technical Requirements for Sealing Structures of Solid Rocket Engines", and the calculation of the sealing structure size is based on the combination of the groove depth h and the groove width b.

[0023] When sealing, the sealing device of the present invention is installed in the installation hole of the plug G through the sealing plug. The plug M and the plug G are connected by threads. When the sealing device is tightened in cooperation with each other, the sealing plug is squeezed, so that the incoming cable is compressed and deformed together with the plug to achieve the sealing of the internal space. A sealing groove structure is provided on the plug G. When the device is installed as a whole and tightened, the plug G and the outer side surface of the plug cover are squeezed to compress and deform the sealing ring to achieve the sealing of the external space.

[0024] The beneficial effects of the present invention are:

[0025] a. Operation degree, greatly improving operability;

[0026] b. In terms of appearance, improve the overall appearance quality of the booster engine;

[0027] c. Eliminate human factors and greatly reduce the risk of air leakage;

[0028] d. Strong reliability and material adaptability improve product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1a This is a schematic diagram of the installation of the booster rocket engine. Figure 1b This is the installation diagram of nozzle plugging and modification. Figure 1c Schematic diagram of the sealing device for the threading hole of the booster rocket engine plug cover.

[0030] Figure 2 This is a schematic diagram of the structure of the sealing device for the threading hole of the booster rocket engine plugging cover.

[0031] Figure 3 Schematic diagram of the test of the sealing device for the threading hole of the booster rocket engine plugging cover.

[0032] Among them, 1-plug M, 2-sealing plug, 3-plug G, 4-bottom surface of sealing plug, 5-plug G mounting hole, 6-sealing groove, 7-booster rocket engine, 8-cable, 9-nozzle plug cover, 10-air tightness detection equipment, 11-booster rocket engine plug cover threading hole sealing device. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] The working condition diagram and the partial diagram of the invention device used in the present invention are shown in FIG1 and Figure 2 As shown below:

[0035] A booster rocket engine plugging cover threading hole sealing device, comprising: a plug M, a sealing plug, a plug G and a sealing ring. To achieve a sealing effect, the specific scheme is as follows:

[0036] The plug M and the plug G are connected by threads, and the material of the plug M and the plug G is engineering plastic;

[0037] There are through holes in the center of plug M, sealing plug and plug G to ensure that the cables can pass through smoothly. The diameter of the center hole of the component is 1.05 times the sum of the cable diameters;

[0038] The center of the nozzle plug of the engine is provided with a through hole, and the diameter of the through hole of the nozzle plug is 1.05 times the diameter of the G thread of the plug;

[0039] The sealing plug is made of silicone material to ensure sufficient compression;

[0040] Plug G is a screw structure, and the nut adopts a hexagonal design.

[0041] The inner cavity of the head of the plug M is a nut semi-enclosed structure, which serves as a mounting hole for the sealing plug;

[0042] The sealing plug is in the shape of a truncated cone, and the diameter of the upper bottom surface of the truncated cone is 0.75 to 0.85 times the diameter of the through hole of the plug G, which is convenient for center alignment and improves installation efficiency. The diameter of the lower bottom surface of the truncated cone is 1.15 to 1.25 times the diameter of the through hole of the plug G. The height of the sealing plug is 0.1 mm to 0.2 mm higher than the length of the through hole of the sealing plug of the plug G, which is convenient for the plug M to completely squeeze the sealing plug into the installation groove of the plug G and ensure that the sealing plug is effectively deformed to squeeze the cable;

[0043] A sealing ring is installed in the sealing groove of plug G. The material of the sealing ring is nitrile rubber to meet the compression amount. The size of the sealing ring is based on the actual size of the sealing groove of plug G and combined with the sealing of the sealing plane rectangular groove in QJ2748A to calculate the ring diameter and rope diameter of the sealing ring;

[0044] The plug M is a hexagonal nut structure, which is convenient for installation.

[0045] The steps of sealing the threading hole of the booster rocket engine plug cover are as follows:

[0046] a. Install the sealing ring in the sealing groove of plug G and pass it through the center hole of the engine nozzle plug cover. The nut part of plug G should be outside the nozzle plug cover. Figure 1b As shown;

[0047] b. The cables pass through the through hole in the center of the plug M, then through the through hole in the center of the sealing plug. The cables enter from the bottom surface of the sealing plug, exit from the top bottom surface, and finally pass through the through hole in the center of the plug G, as shown in Figures 1 and Figure 2 As shown;

[0048] c. Install the sealing plug in the installation hole of the plug G, and screw the plug M and the plug G to squeeze the sealing plug to deform, so as to achieve fastening and sealing;

[0049] d. Until the plugs M and G are tightly attached to the inner and outer surfaces of the nozzle plug cover, tighten the plugs G and M by hand without using external tools or applying force.

[0050] When a 122mm caliber booster rocket engine of a certain type of target drone is assembled with an external aluminum plugging cover, the ignition cable is passed through the wire hole, and the cable is fastened to the aluminum plugging cover hole using the structure of the present invention, and the structure has a sealing effect, thereby achieving the purpose of using the structure of the present invention.

[0051] The specific operation is as follows: after the overall assembly of the booster rocket engine is completed, an external aluminum plugging cover is installed, and the threading hole is blocked with the structure of the present invention and tested by airtight testing equipment, with ventilation of 0.1Mpa and a testing time of 15min. There is no air pressure leakage during the process, which meets the technical requirements.

[0052] Since the product is confidential, the actual use Figure 3 shown.

[0053] The design key points of the present invention are:

[0054] Sealing ring sealing: The processing and installation connection on the engine nozzle plug cover is mainly to put the sealing ring on the plug G and then pass it through the threading hole of the nozzle plug cover. The inner side of the plug G is placed in the sealing plug and then the plug M is screwed on. The cables pass through the above components in sequence and tighten and squeeze the sealing plug to achieve the sealing and tightening effect. Design a new sealing method, combine it with the existing structure of the threading hole of the booster rocket engine plug cover, and combine it with the new sealing method to form a brand new sealing structure.

[0055] a. The structures of all components are designed from the perspective of easy operation and installation;

[0056] b. Use the combination of mechanical mechanism and rubber parts to achieve sealing effect;

[0057] c. The plug G structure is designed with a sealing groove. The corresponding sealing ring is placed in the sealing groove and passed through the aluminum plug cover hole. Then the sealing plug is placed in the plug G and the plug M is screwed on. The peripheral channel is sealed by the sealing ring, and the threading hole channel is sealed by squeezing the sealing plug to deform;

[0058] d. Taking into account the special working conditions, the materials used meet the performance requirements of temperature, aging and reliability.

Claims

1. A sealing device for a threading hole of a booster rocket engine plug cover, comprising a plug M, a sealing plug and a plug G, characterized in that: The booster rocket engine plug cover threading hole sealing device, the sealing plug is installed in the installation hole of the plug G, the plug M and the plug G are screwed, and the sealing plug is squeezed to deform, so as to achieve fastening and sealing.

2. The booster rocket engine plugging cover threading hole sealing device according to claim 1, characterized in that: The plug M and the plug G are connected via threads, and the plug M and the plug G are made of engineering plastics.

3. The sealing device for threading holes of a booster rocket engine plugging cover according to claim 1 is characterized in that: There are through holes in the centers of plug M, sealing plug and plug G to ensure that the cables can pass through smoothly. The diameter of the through hole is 1.05 times the sum of the cable diameters.

4. The booster rocket engine plugging cover threading hole sealing device according to claim 1, characterized in that: A through hole is provided at the center of the nozzle plugging cover of the engine, and the diameter of the through hole of the nozzle plugging cover is 1.05 times the diameter of the G thread of the plug.

5. The sealing device for threading holes of a booster rocket engine plugging cover according to claim 1, characterized in that: The sealing plug is made of silicone material to ensure sufficient compression.

6. The sealing device for threading holes of a booster rocket engine plugging cover according to claim 1, characterized in that: Plug G is a screw structure, and the nut adopts a hexagonal design.

7. The sealing device for threading holes of a booster rocket engine plugging cover according to claim 1, characterized in that: The inner cavity of the head of the plug M is a nut semi-enclosed structure, which serves as a mounting hole for the sealing plug; the outer surface of the plug M is a hexagonal nut structure for easy installation.

8. The sealing device for threading holes of a booster rocket engine plugging cover according to claim 1, characterized in that: The sealing plug is in the shape of a truncated cone, and the diameter of the upper bottom surface of the cone is 0.75 to 0.85 times the diameter of the through hole of the plug G, which is convenient for center alignment and improves installation efficiency. The diameter of the lower bottom surface of the cone is 1.15 to 1.25 times the diameter of the through hole of the plug G. The height of the sealing plug is 0.1mm to 0.2mm higher than the length of the through hole of the plug G, which is convenient for the plug M to completely squeeze the sealing plug into the installation hole of the plug G and ensure that the sealing plug is effectively deformed to squeeze the cable.

9. The booster rocket engine plugging cover threading hole sealing device according to claim 1, characterized in that: It also includes a sealing ring, which is located in a sealing groove on the outer edge of the plug G.

10. The sealing device for threading holes of a booster rocket engine plugging cover according to claim 9, characterized in that: A sealing groove is provided on the outer edge of the plug G, in which a sealing ring is installed. The sealing ring is made of nitrile rubber to meet the compression amount, and the size of the sealing ring is based on the actual size of the sealing groove of the plug G.

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