A composite closure for separating engine nozzles

Abstract

The application provides a composite plug for separating engine nozzle, which comprises a front rubber layer, a rear plug layer and an adhesive; the outer convex surface of the rear plug layer is bonded with the inner concave surface of the front rubber layer by the adhesive; the front rubber layer provides a bonding surface for the composite plug, and the outer convex surface thereof is bonded and solidified with the tapered inclined surface of the expansion section by the adhesive; the rear plug layer provides support for the composite plug, ensures that the damage form of the composite plug is flying out as a whole, and provides power for opening the working of the fairing of the separating engine. The application adopts the combination of the front rubber layer and the rear plug layer, has good sealing performance, high safety and reliability, and has simple structure, low cost, convenient production operation, good universality, good inheritance and good process.

Description

Technical Field

[0001] This invention belongs to the field of solid rocket engine technology, specifically relating to a composite plug for a separate engine nozzle. Background Technology

[0002] As a key component of the engine, the nozzle cap is mainly used for sealing and moisture protection, and for ensuring reliable ignition by shortening the ignition delay time during operation. In solid rocket motors used for interstage separation, the nozzle is usually angled, and the cap must also provide sufficient power to ensure the separation engine cowling on the rocket body opens, ensuring the engine nozzle is unobstructed. Due to the short operating time of the separation engine and minimal impact from erosion, the nozzle expansion section is usually made of metal to save costs and improve manufacturability.

[0003] Existing nozzle plugs are mainly classified into two categories: metal plugs and non-metal plugs. Existing metal plugs exhibit leakage at the bonding interface and after long-term storage, severely impacting the performance of the separation engine. Non-metal plugs, such as rubber plugs, cannot reliably open the separation engine cowling; therefore, existing plug structures cannot be used directly. To address the shortcomings of existing technologies, there is an urgent need for a composite nozzle plug that can open the cowling while ensuring reliable bonding. Summary of the Invention

[0004] The purpose of this invention is to provide a composite plug for separating engine nozzles, which solves the problem that existing plugs cannot simultaneously guarantee bonding reliability and open the fairing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A composite plug for separating engine nozzles includes a front rubber layer, a rear plug layer, and an adhesive; the outer convex surface of the rear plug layer and the inner concave surface of the front rubber layer are bonded together with the adhesive.

[0007] The front rubber layer provides an adhesive surface for the composite plug, and its convex surface is bonded and cured with adhesive to the tapered inclined surface of the expansion section.

[0008] The rear cap layer provides support for the composite cap, ensuring that the composite cap is destroyed as a whole and providing power for the separation of the engine cowling.

[0009] The composite plug can withstand forward and reverse pressure of less than or equal to 0.1 MPa under storage conditions in the temperature range of -55 to 70 ℃.

[0010] The composite plug has an opening and damage area, and the damage mode is that the entire composite plug flies out.

[0011] The area to be opened and damaged is the bonding surface between the composite plug and the expansion section.

[0012] The length of the tapered bonding surface between the front rubber layer and the expansion section is determined by the opening pressure.

[0013] The concave surface of the front rubber layer matches the convex surface of the rear cap layer to form an adhesive surface; the area of ​​the adhesive surface is determined by the front rubber layer.

[0014] The conical surface of the expansion section and the convex surface of the rear cap layer are sanded before bonding to improve bonding reliability.

[0015] The front rubber layer and the rear plug layer are bonded and cured in a mold using an adhesive.

[0016] The expansion section is made of alloy steel, and its inner surface is a tapered slope of 15°~18°.

[0017] The front rubber layer is made of nitrile rubber material and is formed by molding, with a thickness of 1 mm;

[0018] The rear plug layer is made of metal material through machining or spinning, and has a thickness of 0.5~2 mm;

[0019] The adhesive used is 730 glue.

[0020] The expansion section is made of 30CrMnSiA alloy steel.

[0021] The rear plug layer is made of aluminum alloy.

[0022] Compared with the prior art, the beneficial effects achieved by this invention are as follows:

[0023] 1. This invention provides a composite plug made of non-metallic and metallic materials for use in separating engine nozzles by combining a front rubber layer and a rear plug layer. The composite plug achieves reliable sealing by reliably bonding the convex surface of the rubber to the metal surface of the expansion section, resulting in good sealing performance and high safety and reliability.

[0024] 2. The composite plug structure used in this invention is simple, low in cost, easy to produce and operate, has good versatility and inheritance, and has good processability.

[0025] 3. The test results show that the nozzle after the composite plug is bonded does not leak air in a wide temperature range, has good environmental adaptability, and can reliably open the engine cowling, which can meet the usage requirements. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This invention provides a schematic diagram of the composition of a composite plug structure for a rocket separation engine nozzle;

[0028] Figure 2 This is a schematic diagram illustrating the assembly effect of a composite plug for a rocket separation engine nozzle, provided by the present invention.

[0029] Reference numerals: 1. Expansion section; 2. Composite plug; 3. Adhesive; 21. Front rubber layer; 22. Rear plug layer. Specific implementation methods

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention.

[0031] A composite plug for separating engine nozzles includes a front rubber layer 21, a rear plug layer 22, and an adhesive 3; the outer convex surface of the rear plug layer 22 is bonded to the inner concave surface of the front rubber layer 21 by the adhesive 3.

[0032] The front rubber layer 21 provides an adhesive surface for the composite plug 2, and its convex surface is bonded and cured with the tapered inclined surface of the expansion section 1 using adhesive 3.

[0033] The rear cover layer 22 provides support for the composite cover 2, ensuring that the composite cover 2 is destroyed as a whole and provides power for the separation of the engine cowling.

[0034] The composite plug 2 has a forward and reverse pressure resistance of less than or equal to 0.1 MPa under storage conditions in the temperature range of -55~70 ℃.

[0035] The composite plug 2 has an opening and damage area, and the damage mode is that the composite plug 2 flies out as a whole.

[0036] The area to be opened and damaged is the bonding surface between the composite plug 2 and the expansion section 1.

[0037] The length of the tapered bonding surface between the front rubber layer 21 and the expansion section 1 is determined by the opening pressure.

[0038] The concave surface of the front rubber layer 21 matches the convex surface of the rear capping layer 22 to form an adhesive surface; the area of ​​the adhesive surface is determined by the front rubber layer 21.

[0039] Before bonding, the conical surface of the expansion section 1 and the convex surface of the rear cover layer 22 are both sanded to improve bonding reliability.

[0040] The front rubber layer 21 and the rear plug layer 22 are bonded and cured in a mold using adhesive 3;

[0041] The expansion section 1 is made of alloy steel, and its inner surface is a tapered slope of 15°~18°.

[0042] The front rubber layer 21 is made of nitrile rubber material and is formed by molding, with a thickness of 1 mm.

[0043] The rear plug layer 22 is made of metal material through machining or spinning, and has a thickness of 0.5~2 mm;

[0044] The adhesive 3 is 730 glue.

[0045] The expansion section 1 is made of 30CrMnSiA alloy steel.

[0046] The rear cover layer 22 is made of aluminum alloy.

[0047] This embodiment proposes a composite plug for separating engine nozzles, such as... Figure 1 and Figure 2 As shown, the front rubber layer 21 is made using a mold, and the rear plug layer 22 is made by machining or spinning. After grinding the convex surface of the rear plug layer 22, it is bonded to the concave surface of the front rubber layer 21 with adhesive 3 and cured to form a composite plug 2 for later use. The conical inclined portion of the expansion section 1 is ground and bonded to the prepared composite plug 2 with adhesive 3 and cured.

[0048] Tests have shown that this composite plug does not leak air in a wide temperature range of -55 to 70 ℃, and the fairing can be reliably opened during engine separation tests. Therefore, this invention is suitable for the storage sealing and operating conditions of engines in a wide temperature range.

[0049] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention using the disclosed methods and techniques without departing from the spirit and scope of the invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, are all within the protection scope of the present invention. Content not described in detail in this specification is common knowledge to those skilled in the art.

Claims

1. A composite plug for separating engine nozzles, characterized in that: The composite plug (2) includes a front rubber layer (21), a rear plug layer (22), and an adhesive (3); the convex surface of the rear plug layer (22) and the concave surface of the front rubber layer (21) are bonded together by the adhesive (3); The front rubber layer (21) provides an adhesive surface for the composite plug (2), and its convex surface is bonded and cured with the tapered slope of the expansion section (1) using adhesive (3); The rear capping layer (22) provides support for the composite cap (2) to ensure that the failure mode of the composite cap (2) is as a whole flying out; The front rubber layer (21) is made of nitrile rubber material and formed by molding. The rear plug layer (22) is made of metal material and formed by machining or spinning; The expansion section is made of alloy steel. The composite plug (2) has a forward and reverse pressure of less than or equal to 0.1 MPa under storage conditions in the temperature range of -55~70 ℃; The composite plug (2) has an opening and damage area, and the damage mode is that the composite plug (2) flies out as a whole; The opening and damage area is the bonding surface between the composite plug (2) and the expansion section (1).

2. The composite plug for separating engine nozzles according to claim 1, characterized in that: The length of the tapered bonding surface between the front rubber layer (21) and the expansion section (1) is determined by the opening pressure.

3. The composite plug for separating engine nozzles according to claim 1, characterized in that: The concave surface of the front rubber layer (21) matches the convex surface of the rear plug layer (22) to form an adhesive surface; the area of ​​the adhesive surface is determined by the front rubber layer (21).

4. A composite plug for separating engine nozzles according to claim 1, characterized in that: The convex surface of the rear plug layer (22) is polished before bonding to improve bonding reliability.

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