Solid rocket engine combustion chamber front end socket heat insulation layer bonding structure

Abstract

The utility model relates to the technical field of rocket combustion chambers, in particular to a solid rocket engine combustion chamber front end socket heat insulation layer bonding structure which comprises a front end socket shell, an ethylene propylene diene monomer heat insulation layer is bonded to the inner wall of the front end socket shell, a positioning ring is installed on one side of the front end socket shell, and a vacuum bag is arranged on the surface of the front end socket shell in a sleeved mode. A first air nozzle is arranged on the lower surface of the vacuum bag and connected with the vacuum bag through a compression nut, a second air nozzle is installed on the lower surface of the vacuum bag, the first air nozzle and the second air nozzle are arranged in a mirror symmetry mode, and a breathable felt is arranged on the side, close to the vacuum bag, of the ethylene propylene diene monomer heat insulation layer. Bonding forming of the metal shell and the rubber heat insulation layer is achieved through a vacuum autoclave method, bonding of the metal shell and the rubber heat insulation layer which are complex in structure is achieved, bonding is firm, the molded surface of the heat insulation layer is complete and free of bulge cracks, the forming process is simple, and the working efficiency and the production quality of equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rocket combustion chambers, in particular to a solid rocket engine combustion chamber front head insulation layer bonding structure. Background Art

[0002] The combustion chamber of a solid rocket engine is an important part of the solid rocket engine. The design and performance of the combustion chamber have a vital impact on the overall performance of the solid rocket engine, including thrust size, working reliability, etc. Its structure usually needs to have good strength, high temperature resistance and suitable internal shape and size to achieve the best combustion effect and engine performance. Different types of solid rocket engines have different structures and sizes of combustion chambers. Generally speaking, the larger the diameter and length of the combustion chamber, the greater the thrust of the engine. It has a wide range of applications in aerospace, military and other fields. The front head is a solid An important component of the rocket engine combustion chamber, generally used for igniter installation or fixing free-loading grains, is an indispensable part of the combustion chamber. The common front head is generally composed of a front head shell and an insulation layer. The function of the insulation layer is to prevent the front head shell from being damaged by high-temperature and high-combustion gas, affecting the structural integrity of the combustion chamber. Generally, there are two bonding technologies for the front head insulation layer. One is the vulcanization bonding method, that is, after the insulation layer is pressed and vulcanized, it is bonded to the front head shell with an adhesive. The other is integral compression molding, in which the front head shell is used as a part of the tooling, and the compression molding technology is used to press and bond the insulation layer to the surface of the front head shell.

[0003] In daily work, the inventors found that in the process of traditional vulcanization bonding method, due to the certain shrinkage of the insulation layer, the bonding interface with the shell is poor after vulcanization, and the bonding surface needs to be polished. When adhesives are used for bonding, the interface strength is low, and it is easy to cause the quality risk of bulging and debonding, and the production efficiency is low. In order to solve the problem of low interface strength and the quality risk of bulging and debonding, the existing technology uses vulcanization bonding method for processing, but after vulcanization, the bonding interface with the shell is poor, and the bonding surface needs to be polished, which leads to the problem of low production efficiency. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the prior art, such as low interface strength and easy quality risk of bulging and debonding, and proposes a solid rocket engine combustion chamber front head insulation layer bonding structure.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a bonding structure of a front head insulation layer of a solid rocket engine combustion chamber, comprising a front head shell, an inner wall of the front head shell is bonded with an EPDM rubber insulation layer, a positioning ring is installed on one side of the front head shell, a surface of the front head shell is sleeved with a vacuum bag, a first air nozzle is provided on the lower surface of the vacuum bag, the first air nozzle is connected to the vacuum bag through a clamping nut, a second air nozzle is installed on the lower surface of the vacuum bag, the first air nozzle and the second air nozzle are arranged in mirror symmetry, and a breathable felt is provided on the side of the EPDM rubber insulation layer close to the vacuum bag. By setting the utility model, a vacuum autoclave method is used to realize the bonding molding of a metal shell and a rubber insulation layer, thereby realizing the bonding of a metal shell with a complex structure and a rubber insulation layer, with firm bonding, a complete insulation layer profile, and no bulging or cracks, and a simple molding process, thereby improving the working efficiency and production quality of the equipment.

[0006] Preferably, the side of the first air nozzle away from the vacuum bag is connected to the autoclave vacuum tube, and the side of the second air nozzle away from the vacuum bag is connected to the autoclave vacuum gauge tube. By arranging the second air nozzle to be connected to the autoclave vacuum gauge tube, it is convenient to read the vacuum degree in the device.

[0007] Preferably, the connection of the opening of the vacuum bag is sealed with a high temperature resistant rubber strip, and the vacuum bag can withstand a high temperature of 200°C. By providing the vacuum bag, the quality of equipment bonding is increased and the efficiency of equipment bonding is improved.

[0008] Preferably, the breathable felt is made of nylon fiber material, and the vacuum bag wraps the entire device. The breathable felt is provided to facilitate isolation of the EPDM rubber insulation layer and the front head shell.

[0009] Preferably, the first air nozzle and the second air nozzle are arranged on the side of the vacuum bag away from the front head shell, and the positioning ring is connected to the front head shell by a thread. The positioning ring is provided to position the end face dimensions of the front head shell and the EPDM rubber insulation layer to ensure the thickness and size of the end face.

[0010] Compared with the prior art, the advantages and positive effects of the utility model are:

[0011] In the utility model, the portion where the front head shell is bonded to the insulation layer is firstly sandblasted, cleaned and glued, then the insulation layer film to be bonded is affixed to the bonding position by hand and compacted, the positioning ring is connected and assembled to the front head shell through a thread, the entire front head shell is wrapped with a breathable felt, and then the breathable felt is wrapped with a vacuum bag, and then the first air nozzle and the second air nozzle are respectively fixed to the surface of the vacuum bag and pressed, and the opening of the vacuum bag is bonded and sealed with a high-temperature adhesive strip. After the assembly is completed, the product is placed in an autoclave, the first air nozzle is connected to the air pipe of the autoclave, and the second air nozzle is connected to the air pipe of the vacuum gauge. The entire connection system should be airtight and leak-proof, the vacuum switch of the autoclave is turned on, and the inspection is carried out. The system vacuum degree should be no more than -0.09MPa and there should be no air leakage, then close the autoclave door, set the pressure and temperature program, start the program for vulcanization molding, after the vulcanization is completed, close the program, release the pressure and cool to room temperature, disconnect the first air nozzle, the second air nozzle and the autoclave, then take out the product, remove the vacuum bag and the breathable felt respectively, separate the positioning ring from the front head shell, obtain the product for inspection, by setting the utility model, the vacuum autoclave method is used to realize the bonding molding of the metal shell and the rubber insulation layer, the bonding of the metal shell with a complex structure and the rubber insulation layer is realized, the bonding is firm, the insulation layer has a complete surface, there is no bulging crack, and the molding process is simple, which improves the working efficiency and production quality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the front head shell structure of a solid rocket engine combustion chamber front head insulation layer bonding structure is proposed for the utility model;

[0013] Figure 2 The utility model provides a three-dimensional structural schematic diagram of a solid rocket engine combustion chamber front head insulation layer bonding structure.

[0014] Legend: 1. Front head shell; 2. EPDM rubber insulation layer; 3. First air nozzle; 4. Second air nozzle; 5. Vacuum bag; 6. Breathable felt; 7. Positioning ring. DETAILED DESCRIPTION

[0015] See also Figure 1-2 The utility model provides a technical solution: a solid rocket engine combustion chamber front head insulation layer bonding structure, including a front head shell 1.

[0016] In this embodiment: an EPDM rubber insulation layer 2 is bonded to the inner wall of the front head shell 1, a positioning ring 7 is installed on one side of the front head shell 1, a vacuum bag 5 is sleeved on the surface of the front head shell 1, a first air nozzle 3 is provided on the lower surface of the vacuum bag 5, the first air nozzle 3 is connected to the vacuum bag 5 through a clamping nut, a second air nozzle 4 is installed on the lower surface of the vacuum bag 5, the first air nozzle 3 and the second air nozzle 4 are mirror-symmetrically arranged, and an air-permeable felt 6 is provided on the side of the EPDM rubber insulation layer 2 close to the vacuum bag 5. By setting the utility model, the vacuum autoclave method is used to realize the bonding molding of the metal shell and the rubber insulation layer, and the bonding of the metal shell with a complex structure and the rubber insulation layer is realized, the bonding is firm, the insulation layer has a complete surface, there is no bulging cracks, and the molding process is simple, thereby improving the working efficiency and production quality of the equipment.

[0017] Specifically, a side of the first air nozzle 3 away from the vacuum bag 5 is externally connected to the autoclave vacuum tube, and a side of the second air nozzle 4 away from the vacuum bag 5 is externally connected to the autoclave vacuum gauge tube.

[0018] In this embodiment, the second gas nozzle 4 is connected to the autoclave vacuum gauge tube to facilitate reading the vacuum degree in the device.

[0019] Specifically, the connection of the opening of the vacuum bag 5 is sealed with a high temperature resistant rubber strip, and the vacuum bag 5 can withstand a high temperature of 200°C.

[0020] In this embodiment, by providing the vacuum bag 5, the quality of device bonding is increased and the efficiency of device bonding is improved.

[0021] Specifically, the breathable felt 6 is made of nylon fiber material, and the vacuum bag 5 wraps the entire device. The breathable felt 6 is provided to facilitate isolation of the EPDM rubber insulation layer 2 and the front head shell 1.

[0022] Specifically, the first gas nozzle 3 and the second gas nozzle 4 are arranged on a side of the vacuum bag 5 away from the front head shell 1, and the positioning ring 7 is connected to the front head shell 1 through threads.

[0023] In this embodiment, a positioning ring 7 is provided to position the end face dimensions of the front head shell 1 and the EPDM rubber insulation layer 2 to ensure the thickness and dimensions of the end face.

[0024] Working principle: firstly, sandblast, clean and glue the part where the front head shell 1 is bonded to the insulation layer, then stick the insulation layer film to be bonded at the bonding position by hand and compact it, connect the positioning ring 7 to the front head shell 1 through threads and assemble it in place, wrap the entire front head shell 1 with air-permeable felt 6, and then wrap the air-permeable felt 6 with a vacuum bag 5, then fix the first air nozzle 3 and the second air nozzle 4 on the surface of the vacuum bag 5 respectively and press them, and use high-temperature adhesive strips to bond and seal the opening of the vacuum bag 5. After the assembly is completed, place the product in the autoclave, connect the first air nozzle 3 to the air pipe of the autoclave, and connect the second air nozzle 4 to the air pipe of the vacuum gauge. The whole connection system should be airtight and leak-proof, and turn on the vacuum switch of the autoclave. , the vacuum degree of the inspection system should be no more than -0.09MPa, and there should be no air leakage, then close the autoclave door, set the pressure and temperature program, start the program for vulcanization molding, after the vulcanization is completed, close the program, release the pressure and cool down to room temperature, disconnect the first air nozzle 3, the second air nozzle 4 from the autoclave, and then take out the product, remove the vacuum bag 5 and the breathable felt 6 respectively, separate the positioning ring 7 from the front head shell 1, and obtain the product for inspection. By setting up the utility model, the vacuum autoclave method is used to realize the bonding molding of the metal shell and the rubber insulation layer, and the bonding of the metal shell with a complex structure and the rubber insulation layer is realized. The bonding is firm, the insulation layer has a complete surface, no bulging cracks, and the molding process is simple, which improves the working efficiency and production quality of the equipment.

Claims

1. A solid rocket engine combustion chamber front head insulation layer bonding structure, comprising a front head shell (1), characterized in that: The inner wall of the front head shell (1) is bonded with an EPDM rubber insulation layer (2), a positioning ring (7) is installed on one side of the front head shell (1), a vacuum bag (5) is sleeved on the surface of the front head shell (1), a first air nozzle (3) is arranged on the lower surface of the vacuum bag (5), the first air nozzle (3) is connected to the vacuum bag (5) through a clamping nut, a second air nozzle (4) is installed on the lower surface of the vacuum bag (5), the first air nozzle (3) and the second air nozzle (4) are arranged in mirror symmetry, and a breathable felt (6) is arranged on the side of the EPDM rubber insulation layer (2) close to the vacuum bag (5).

2. The solid rocket engine combustion chamber front head insulation layer bonding structure according to claim 1, characterized in that: The side of the first air nozzle (3) away from the vacuum bag (5) is externally connected to the autoclave vacuum pipe, and the side of the second air nozzle (4) away from the vacuum bag (5) is externally connected to the autoclave vacuum gauge pipe.

3. The solid rocket engine combustion chamber front head insulation layer bonding structure according to claim 1, characterized in that: The connection of the opening of the vacuum bag (5) is sealed with a high temperature resistant rubber strip, and the vacuum bag (5) can withstand a high temperature of 200°C.

4. The solid rocket engine combustion chamber front head insulation layer bonding structure according to claim 1, characterized in that: The material of the air-permeable felt (6) is nylon fiber material, and the vacuum bag (5) wraps the entire device.

5. The solid rocket engine combustion chamber front head insulation layer bonding structure according to claim 1, characterized in that: The first air nozzle (3) and the second air nozzle (4) are arranged on a side of the vacuum bag (5) away from the front head shell (1), and the positioning ring (7) is connected to the front head shell (1) via threads.

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