Engine blanking cap with noise reduction function

Abstract

The utility model discloses an engine blanking cap with a noise reduction function. The engine blanking cap comprises a hollow non-metal packaging shell, tungsten powder packaged in an inner cavity of the non-metal packaging shell, and a metal connecting piece fixedly adhered to the outer side of the non-metal packaging shell. Connecting threads matched with the inner wall of the rear end of the engine shell are machined on the outer wall of the metal connecting piece. The engine blanking cap is connected to the rear end of an engine shell through the metal connecting piece. The engine blanking cap not only has the conventional functions of sealing, preventing moisture, preventing redundant materials from entering and providing opening pressure, but also can reduce noise during emission, and is convenient for daily service treatment.

Description

Technical Field

[0001] This utility model belongs to the field of individual rocket technology and relates to an engine plug with noise reduction function. Background Technology

[0002] When a man-portable rocket is launched, the rocket engine generates a high-temperature, high-speed, and high-pressure unsteady and complex flow field in the tail nozzle, resulting in high-intensity noise and a long flame, which is detrimental to the concealment of the rocket and the safety of the shooter during launch. Supersonic gas jet noise is one of the main characteristics of man-portable rocket launches. It is caused by the intense turbulent pulsation formed by the rapid mixing of high-speed gas with the surrounding relatively stationary medium.

[0003] Currently, various noise reduction solutions are employed, including tailpipe mufflers, multi-nozzle noise reduction, liquid injection noise reduction, and liquid column balancing bodies. Tailpipe mufflers are large in size and have a large capacity, while liquid injection noise reduction systems are complex and have limited practical application. Multi-nozzle noise reduction can reduce jet turbulence intensity and increase jet mixing area, transferring low-frequency energy to higher frequencies, but it introduces aerodynamic losses and increased weight, limiting its practical application. Liquid column balancing bodies involve placing a liquid column balancing body of a certain mass behind the engine nozzle. This body absorbs some heat to reduce the combustion gas temperature and consumes combustion gas energy, thereby reducing the total energy of the combustion gas jet and achieving noise reduction. However, long-term storage of liquid column balancing bodies poses a risk of leakage and seepage, limiting its application when high-precision maintenance is required.

[0004] The plug is a component of a solid rocket motor, primarily functioning to seal, prevent moisture, prevent foreign matter from entering, and provide the necessary pressure to ensure proper combustion of the propellant after ignition. Plugs are mainly classified into two categories: metal plugs and non-metal plugs. Individual rocket motors mostly use non-metallic plugs to avoid injury to personnel from afterburner debris if the plug breaks. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an engine plug with noise reduction function, which is suitable for noise reduction of man-portable rockets.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] This utility model provides an engine plug with noise reduction function, comprising a hollow non-metallic packaging shell, tungsten powder encapsulated in the inner cavity of the non-metallic packaging shell, and a metal connector adhered to the outer side of the non-metallic packaging shell.

[0008] The outer wall of the metal connector is machined with connecting threads that match the inner wall of the rear end of the engine housing.

[0009] The engine plug is connected to the rear end of the engine shell through the metal connecting piece.

[0010] The working process of the utility model is:

[0011] The engine plug is connected to the rear end of the engine shell through the metal connecting piece.

[0012] The beneficial effects of the utility model are:

[0013] The engine plug of the utility model can reduce noise during launching in addition to the conventional sealing, moisture-proof, prevention of excess material from entering, and provision of opening pressure functions, and is convenient for daily service processing. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model engine plug's structural diagram is provided;

[0015] In the figure, 1-nonmetallic shell, 2-metal connecting piece, 3-tungsten powder. DETAILED DESCRIPTION

[0016] The contents of the utility model are further described below in combination with the drawings and examples:

[0017] Example

[0018] As Figure 1 shown, the utility model discloses an engine plug with noise reduction function, which comprises a hollow nonmetallic packaging shell 1, tungsten powder 3 encapsulated in the inner cavity of the nonmetallic packaging shell 1, and a metal connecting piece 2 adhered to the outer side of the nonmetallic packaging shell 1.

[0019] The outer wall of the metal connecting piece 2 is processed with connecting threads matched with the inner wall of the rear end of the engine shell.

[0020] The engine plug is connected to the rear end of the engine shell through the metal connecting piece 2.

[0021] The working process of the utility model is:

[0022] The engine plug cover is installed, and daily service treatment is facilitated, the requirements of non-damage drop and safe drop can be met, when the engine works, the propellant is ignited, the combustion chamber pressure rises, when the combustion chamber pressure reaches the breaking pressure (i.e. the plug opening pressure) of the non-metal packaging shell 1, the non-metal packaging shell 1 is broken, the tungsten powder flows out under the action of the gas, and is dispersed into the surrounding air, under the action of the gas, the speed of the tungsten powder 3 particles increases, the temperature rises, part of the energy is transferred from the gas to the tungsten powder, so that the total energy of the gas jet is reduced, and the noise reduction effect is achieved.

Claims

1. An engine cover having a noise reduction function, characterized by, The non-metallic packaging shell comprises an inner hollow, tungsten powder is packaged in the inner cavity of the non-metallic packaging shell, and a metal connecting piece is fixed on the outer side of the non-metallic packaging shell. An outer wall of the metal connecting piece is processed with connecting threads matched with the inner wall of the rear end of the engine shell. The engine plug is connected to the rear end of the engine shell through the metal connecting piece.

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