Combustion chamber shell and rear end socket based on winding forming of carbon fibers

Abstract

The invention relates to the technical field of rockets, in particular to a combustion chamber shell and rear end socket based on winding forming of carbon fibers, which comprises a combustion chamber barrel, a front end socket top cover is fixedly connected to one end of the combustion chamber barrel, and a mounting hole is formed in the side surface of the front end socket top cover; a combustion chamber barrel, a front end socket top cover, a connecting channel and an ethylene-propylene-diene monomer insulating layer are used in cooperation, the combustion chamber barrel and a rear end socket piece are both made of carbon fiber composite materials, the forming technology of the carbon fiber composite materials comprises winding, mold pressing, curing and the like, and the winding technology is especially key. The front end socket top cover is made of aluminum alloy, the aluminum alloy is widely applied due to the characteristics of light weight, high strength, good corrosion resistance and the like, the heat insulation layer is made of ethylene-propylene-diene monomer, in a solid rocket engine, the ethylene-propylene-diene monomer heat insulation layer plays an important role, and the heat insulation effect is good. Not only is necessary thermal protection provided, but also the structural integrity of the engine can be maintained.

Description

Technical Field

[0001] This invention relates to the field of rocket technology, specifically to a combustion chamber shell and aft end cap based on carbon fiber winding molding. Background Technology

[0002] The engine casing, also known as the combustion chamber, not only houses the solid propellant but also withstands the internal pressure of the high-temperature, high-pressure combustion gas flow and the axial pressure of the load during engine operation. The design and material selection of the casing play a crucial role in the engine's efficiency and structural reliability. Traditional casing materials include high-strength alloy steel, aluminum alloys, or titanium alloys, which possess excellent mechanical and thermal conductivity properties, making them suitable for high-temperature and high-pressure environments. However, the high density and low specific strength of metallic materials result in a large inert mass for the metal casing, limiting their application in high-performance rockets and missiles.

[0003] Composite material housings not only reduce the overall structural weight of the engine but also possess excellent strength and stiffness, improving housing performance. Carbon fiber exhibits superior properties such as high density, high modulus, high temperature resistance, and low density. Combustion chamber housings and rear end caps made of carbon fiber can withstand the extreme environments of high temperature and high pressure within the combustion chamber. Compared to traditional metal materials, they can significantly reduce housing weight while maintaining strength. Therefore, this paper proposes a combustion chamber housing and rear end cap based on carbon fiber winding molding to address the aforementioned issues. Summary of the Invention

[0004] The purpose of this invention is to provide a combustion chamber shell and a rear end cap based on carbon fiber winding molding, in order to solve the problem mentioned in the background art that the high density and low specific strength of metal materials result in a large inert mass of the metal shell, which limits its application in high-performance rockets and missiles.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A combustion chamber shell and rear end cap based on carbon fiber winding molding are disclosed, comprising a combustion chamber cylinder, a front end cap fixedly connected to one end of the combustion chamber cylinder, an installation hole provided on the side of the front end cap, a connecting channel fixedly connected in the installation hole, an extension plate fixedly connected to the outer surface of the connecting channel, the extension plate extending into the front end cap and fixedly connected to the inner wall of the front end cap, an EPDM insulation layer fixedly connected to the inner wall of the combustion chamber cylinder, the connecting channel communicating with the combustion chamber cylinder, and the combustion chamber cylinder being made of carbon fiber material.

[0006] As a preferred embodiment of the present invention, a reinforcing plate is provided on the outer surface of the combustion chamber cylinder. The reinforcing plate is located at the connection between the combustion chamber cylinder and the front end cap. A fixing bolt is provided on the side of the reinforcing plate. The fixing bolt passes through the reinforcing plate and extends into the combustion chamber cylinder. The fixing bolt is threadedly connected to the reinforcing plate.

[0007] As a preferred embodiment of the present invention, the front end cap is made of aluminum alloy, and the side surface of the front end cap is arc-shaped.

[0008] As a preferred embodiment of the present invention, the inner surface wall of the combustion chamber cylinder is provided with a connecting groove, and the combustion chamber cylinder is cylindrical in shape.

[0009] As a preferred embodiment of the present invention, a plurality of fixing bolts are provided, and the plurality of fixing bolts are arranged in a ring array on the outer surface of the reinforcing plate.

[0010] As a preferred embodiment of the present invention, a rear end cap is provided at the other end of the combustion chamber cylinder, a connecting strip is fixedly connected to the outer surface of the rear end cap, the rear end cap extends into the combustion chamber cylinder, and the connecting strip engages with the connecting slot.

[0011] As a preferred embodiment of the present invention, a gas passage is fixedly connected to the side of the rear end cap, and a carbon fiber protective layer is fixedly connected to the outer surface of the gas passage.

[0012] As a preferred embodiment of the present invention, the inner surface of the rear end cap is fixedly connected to a reinforcing base plate, and the rear end cap is composed of a carbon fiber layer and metal connectors.

[0013] In a preferred embodiment of the present invention, the combustion chamber cylinder and the rear end cap are connected, and the rear end cap is connected to the gas passage.

[0014] As a preferred embodiment of the present invention, the gas passage is provided with six channels, and the six gas passages have the same diameter.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the combustion chamber cylinder, the front end cap, the connecting channel, and the EPDM insulation layer are used in combination. Both the combustion chamber cylinder and the rear end cap are made of carbon fiber composite material. The molding technology of carbon fiber composite material includes winding, molding, and curing. The winding process is particularly critical, as it can ensure the stability and uniformity of the shell under high pressure. The front end cap is made of aluminum alloy. Aluminum alloy is widely used due to its lightweight, high strength, and good corrosion resistance. The insulation layer is made of EPDM. In solid rocket motors, the EPDM insulation layer plays a crucial role, not only providing necessary thermal protection but also helping to maintain the structural integrity of the engine.

[0016] 2. In this invention, the rear end cap, gas passage, carbon fiber protective layer, connecting slot, and connecting strip are used in combination. To achieve lightweighting and enhance structural strength, the rear end cap is made of carbon fiber composite material. The rear end cap consists of a carbon fiber layer and a metal connector. The metal connector contains six gas passages that can connect the combustion chamber and the nozzle, guiding the high-temperature and high-pressure gas smoothly from the combustion chamber to the nozzle, and finally ejecting it at high speed to generate thrust. The combination of the connecting slot and connecting strip not only provides reliable connection and sealing to ensure the normal operation of the combustion chamber, but also has a certain degree of elasticity and adaptability to accommodate the size differences and thermal expansion between different components. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a schematic diagram of the rear end cap structure of the present invention; Figure 4 This is a schematic diagram of the combustion chamber cylinder structure of the present invention; Figure 5 This is a schematic diagram of the front end cap structure of the present invention; Figure 6 This is a schematic diagram of the rear end cap structure of the present invention.

[0018] In the diagram: 1. Combustion chamber cylinder; 2. Front end cap; 3. Carbon fiber sheath; 4. Connecting channel; 5. Reinforcing plate; 6. Fixing bolts; 7. Rear end cap; 8. Gas passage; 9. Connecting slot; 10. Connecting strip; 11. EPDM insulation layer; 12. Mounting hole; 13. Extension plate; 14. Reinforcing base plate. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] For examples, please refer to Figures 1-6 The present invention provides a technical solution: A combustion chamber shell and rear end cap based on carbon fiber winding molding includes a combustion chamber cylinder 1. A front end cap 2 is fixedly connected to one end of the combustion chamber cylinder 1. An installation hole 12 is provided on the side of the front end cap 2. A connecting channel 4 is fixedly connected in the installation hole 12. An extension plate 13 is fixedly connected to the outer surface of the connecting channel 4. The extension plate 13 extends into the front end cap 2 and is fixedly connected to the inner wall of the front end cap 2. An EPDM insulation layer 11 is fixedly connected to the inner wall of the combustion chamber cylinder 1. The connecting channel 4 communicates with the combustion chamber cylinder 1. The combustion chamber cylinder 1 is made of carbon fiber material.

[0021] The combustion chamber cylinder 1 and the rear end cap 7 are both made of carbon fiber composite material. The molding technology of carbon fiber composite material includes winding, molding, and curing. The winding process is particularly critical, as it can ensure the stability and uniformity of the shell under high pressure.

[0022] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a reinforcing plate 5 is provided on the outer surface of the combustion chamber cylinder 1. The reinforcing plate 5 is located at the connection between the combustion chamber cylinder 1 and the front end cap 2. Fixing bolts 6 are provided on the side of the reinforcing plate 5, penetrating the reinforcing plate 5 and extending into the combustion chamber cylinder 1. The fixing bolts 6 are threadedly connected to the reinforcing plate 5. The front end cap 2 is made of aluminum alloy, and its side surface is arc-shaped. A connecting groove 9 is provided on the inner wall of the combustion chamber cylinder 1. The combustion chamber cylinder 1 is cylindrical in shape. Multiple fixing bolts 6 are arranged in a circular array on the outer surface of the reinforcing plate 5. A rear end cap 7 is provided at the other end of the cylinder 1. A connecting strip 10 is fixedly connected to the outer surface of the rear end cap 7. The rear end cap 7 extends into the combustion chamber cylinder 1. The connecting strip 10 engages with the connecting groove 9. A gas passage 8 is fixedly connected to the side of the rear end cap 7. A carbon fiber protective layer 3 is fixedly connected to the outer surface of the gas passage 8. A reinforcing base plate 14 is fixedly connected to the inner wall of the rear end cap 7. The material of the rear end cap 7 is composed of a carbon fiber layer and metal connectors. The combustion chamber cylinder 1 and the rear end cap 7 are connected. The rear end cap 7 and the gas passage 8 are connected. There are six gas passages 8, and the six gas passages 8 have the same diameter.

[0023] The combustion chamber cylinder 1 and the rear end cap 7 are both made of carbon fiber composite material. The molding technology of carbon fiber composite material includes winding, molding, and curing. The winding process is particularly critical, as it can ensure the stability and uniformity of the shell under high pressure.

[0024] The workflow of this invention is as follows: When using the combustion chamber shell and rear end cap based on carbon fiber winding designed in this scheme, first check whether the device is working properly. Install and fix the front end cap 2 to one end of the combustion chamber cylinder 1. Then, tightly wrap the carbon fiber protective layer 3 around the outer wall of the gas passage 1 to ensure uniform coverage without obvious gaps. Subsequently, fix the reinforcing plate 5 to the connection between the front end cap 2 and the combustion chamber cylinder 1 with fixing bolts 6. The rear end cap 7 is firmly connected to the other end of the combustion chamber cylinder 1. The connecting strip 10 is fixed in the connecting slot 9 to form a complete sealed space. During this process, the EPDM insulation layer 11 is fixed to the inner surface wall of the combustion chamber cylinder 1 to enhance the stability and sealing of the overall structure. The connection between the gas passage 8 and the connecting passage 4 should be smooth and unobstructed. At the same time, the combined use of the extension plate 13 and the reinforcing base plate 14 can further improve the device's compressive strength. Finally, after confirming that all components are installed in place, perform a functional test on the entire system to verify whether its operating status meets the design requirements.

[0025] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A combustion chamber shell based on carbon fiber winding, comprising a combustion chamber cylinder (1), characterized in that: One end of the combustion chamber cylinder (1) is fixedly connected to a front end cap (2). The side of the front end cap (2) is provided with an installation hole (12). A connection channel (4) is fixedly connected in the installation hole (12). An extension plate (13) is fixedly connected to the outer surface of the connection channel (4). The extension plate (13) extends into the front end cap (2) and is fixedly connected to the inner wall of the front end cap (2). A EPDM insulation layer (11) is fixedly connected to the inner wall of the combustion chamber cylinder (1). The connection channel (4) communicates with the combustion chamber cylinder (1). The combustion chamber cylinder (1) is made of carbon fiber material.

2. The combustion chamber shell based on carbon fiber winding according to claim 1, characterized in that, The outer surface of the combustion chamber cylinder (1) is provided with a reinforcing plate (5). The reinforcing plate (5) is located at the connection between the combustion chamber cylinder (1) and the front end cap (2). The side of the reinforcing plate (5) is provided with a fixing bolt (6). The fixing bolt (6) passes through the reinforcing plate (5) and extends into the combustion chamber cylinder (1). The fixing bolt (6) is threadedly connected to the reinforcing plate (5).

3. The combustion chamber shell based on carbon fiber winding according to claim 1, characterized in that, The front end cap (2) is made of aluminum alloy, and the side of the front end cap (2) is arc-shaped.

4. A combustion chamber shell based on carbon fiber winding according to claim 1, characterized in that, The inner surface of the combustion chamber cylinder (1) is provided with a connecting groove (9), and the combustion chamber cylinder (1) is cylindrical in shape.

5. A combustion chamber shell based on carbon fiber winding according to claim 2, characterized in that, Multiple fixing bolts (6) are provided, and the multiple fixing bolts (6) are arranged in a ring on the outer surface of the reinforcing plate (5).

6. A rear end cap for a combustion chamber shell based on carbon fiber winding, applicable to a combustion chamber shell based on carbon fiber winding as described in any one of claims 1-5, characterized in that, The other end of the combustion chamber cylinder (1) is provided with a rear end cap (7), and a connecting strip (10) is fixedly connected to the outer surface of the rear end cap (7). The rear end cap (7) extends into the combustion chamber cylinder (1), and the connecting strip (10) engages with the connecting groove (9).

7. The combustion chamber shell rear end cap based on carbon fiber winding as described in claim 6, characterized in that, The side of the rear end cap (7) is fixedly connected to a gas passage (8), and the outer surface of the gas passage (8) is fixedly connected to a carbon fiber protective layer (3).

8. The combustion chamber shell rear end cap based on carbon fiber winding as described in claim 6, characterized in that, The inner wall of the rear end cap (7) is fixedly connected to a reinforcing base plate (14), and the material of the rear end cap (7) is composed of a carbon fiber layer and metal connectors.

9. The combustion chamber shell rear end cap based on carbon fiber winding molding according to claim 7, characterized in that, The combustion chamber cylinder (1) is connected to the rear end cap (7), and the rear end cap (7) is connected to the gas passage (8).

10. The combustion chamber shell rear end cap based on carbon fiber winding according to claim 9, characterized in that, The gas passage (8) is provided in six sections, and the six gas passages (8) have the same diameter.

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