Redundant sealing structure for underwater long-endurance engine blanking cap

Abstract

The invention discloses a redundant sealing structure for an underwater long-endurance engine blanking cap. The redundant sealing structure comprises the blanking cap, a cabin-passing connector, a sealing cushion block, a nut and a sealing ring. And the cabin-passing connector penetrates through the blanking cap with the hole, and forms a double-channel redundant sealing structure with the sealing cushion block, the nut and the sealing ring. According to the redundant sealing structure provided by the invention, the engine jet pipe is subjected to inner and outer sealing under water, the problem of poor sealing reliability existing in single sealing is solved, and the sealing reliability, safety and maintainability of an underwater engine are improved. The invention has the advantages of good sealing performance, high safety and reliability, temperature resistance, high pressure resistance, simple structure, low cost and good universality.

Description

Technical Field

[0001] The invention relates to the technical field of solid rocket engines, and in particular to a redundant sealing structure for a plugging cover of an underwater long-flight engine. Background Art

[0002] Sealing technology is widely used in the field of solid rocket engine technology. At present, the main sealing forms used are end face sealing and radial sealing. The radial seal can adopt a dual-channel redundant sealing design. Patent CN203585314U proposes that the end face seal can only adopt an O-ring or a combination gasket or a copper gasket sealing form due to structural limitations. During use, it is easy to cause poor sealing reliability due to processing problems, pressure deformation problems, etc. When conventional solid engines are connected from the plugging cover, a single-channel seal is generally set to meet service processing and use requirements. For engines that are stored underwater and work for a long time, considering the thermal protection performance, the ignition wire is generally led out from the plugging cover. Due to the pressure difference between the inside and outside of the engine plugging cover, the conventional single-channel seal has a single point failure.

[0003] In order to meet the needs of sealing the ignition electrical connector at the engine plugging cover for long underwater flight, it is urgently necessary to design a redundant sealing structure at the plugging cover to solve the problem of poor sealing reliability of single-channel sealing. At the same time, it needs to be simple and convenient to install and operate, and have a simple structure, low cost and good versatility to ensure reliable sealing and reliable operability of the engine. Summary of the invention

[0004] The object of the present invention is to provide a redundant sealing structure for an underwater long-duration engine plugging cover, which has the advantages of good sealing, high safety and reliability, temperature and high pressure resistance, simple structure, low cost and good versatility.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: to provide a redundant sealing structure for an underwater long-duration engine plugging cover, comprising a plugging cover 6, a through-cabin connector 1, a sealing gasket 2, a nut 3, a first sealing ring 4, and a second sealing ring 5;

[0006] The plug cover 6 has a through hole in the middle, and the semi-threaded through-cabin electrical connector 1 has two sealing grooves, namely an end face sealing groove and a radial sealing groove;

[0007] The through-cabin connector 1 passes through the through hole in the middle of the blocking cover 6, and the first sealing ring 4 is placed in the end face sealing groove; the second sealing ring 5 is placed in the radial sealing groove; the sealing gasket 2 is inserted into the through-cabin electrical connector 1 and fastened with a nut 3.

[0008] Furthermore, the through-cabin connector 1, the plug cover 6, and the first sealing ring 4 form an end face seal, forming a single-side seal of the engine plug cover;

[0009] The through-cabin connector 1 forms a radial seal with the sealing gasket 2 and the sealing ring 5, and the sealing gasket 2 forms an end face seal with the plug cover 6 and the sealing ring 4, forming a seal on the other side of the engine plug cover.

[0010] Furthermore, the through-cabin connector 1 is a semi-threaded structure with a sealing groove on the end face, the column section has a sealing groove, and the rest is a threaded section, and multiple paths are provided inside for transmitting ignition commands.

[0011] Furthermore, the sealing gasket block 2 is a structure with a sealing groove on the end face; the nut 3 is an internal thread structure, which matches the thread of the through-cabin connector 1.

[0012] Furthermore, the first sealing ring 4 and the second sealing ring 5 are both O-rings made of fluorosilicone rubber.

[0013] The redundant sealing structure for underwater long-duration engine plugging cover provided by the present invention has the following beneficial effects:

[0014] The present invention adopts a combination of end face sealing and radial sealing to achieve double-channel redundant sealing at the engine plug cover for long-endurance underwater. The through-cabin electrical connector is connected to the engine plug cover by threads to ensure reliable connection, and reliable sealing is achieved through the sealing ring. The through-cabin connector itself has a simple structure, and the threaded connection is easy to install and operate. It has good circuit conductivity and insulation with the shell. The structural design of placing the through-cabin electrical connector on the plug cover reduces the airflow disturbance to the engine combustion chamber and protects the integrity of the internal thermal protection structure of the engine to the greatest extent. The test results show that this sealing structure can meet the requirements for ensuring the underwater use of the engine. The present invention has the advantages of good sealing, high safety and reliability, temperature and high pressure resistance, simple structure, low cost and good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The invention will be further described below in conjunction with the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the assembly effect of a redundant sealing structure for an underwater long-endurance engine plugging cover provided by the present invention. DETAILED DESCRIPTION

[0017] The redundant sealing structure for the underwater long-duration engine plug cover proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0018] The technical solution of the present invention is:

[0019] A redundant sealing structure for an underwater long-endurance engine plugging cover, comprising a plugging cover, a through-cabin connector, a sealing gasket, a nut and a sealing ring, wherein the through-cabin connector and the plugging cover, the sealing gasket, the nut and the sealing ring are respectively sealed by end faces and sealed radially to form a double-channel redundant sealing structure;

[0020] The through-cabin connector, the plug cover and the sealing ring form an end face seal to form a single-side seal of the engine plug cover; the through-cabin connector, the sealing gasket and the sealing ring form a radial seal, and the sealing gasket, the plug cover and the sealing ring form an end face seal to form a seal on the other side of the engine plug cover.

[0021] The through-cabin connector is a semi-threaded structure with a sealing groove on the end face, the column section has a sealing groove, and the rest is a threaded section, and multiple conductions can be set inside for ignition command transmission;

[0022] The sealing pad block 2 is a structure with a sealing groove on the end surface;

[0023] The nut 3 is an internal thread structure, which matches the thread of the through-cabin connector 1;

[0024] The sealing rings 4 and 5 are both O-rings, and their material is fluorosilicone rubber;

[0025] The blocking cover 6 is a porous structure, and its thickness and hole diameter are designed according to needs.

[0026] Example 1

[0027] This embodiment proposes a redundant sealing structure for an underwater long-duration engine plug cover, such as Figure 1 As shown, a through hole is opened in the middle of the plugging cover 6, and a sealing ring 4 is first placed in the end face sealing groove of the semi-threaded through-cabin electrical connector 1 with two sealing grooves, and then passes through the through hole of the plugging cover 6, and a sealing ring 5 is placed in the radial sealing groove. The sealing gasket block 2 with the sealing ring 4 in the sealing groove is inserted into the through-cabin electrical connector 1 and fastened with a nut 3.

[0028] Experiments have shown that the present invention is suitable for underwater storage and working conditions where the working time of the underwater engine is not less than 40 seconds.

[0029] The contents not described in detail in this specification belong to the prior art known to those skilled in the art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A redundant sealing structure for underwater long-duration engine plugging cover, characterized in that: It comprises a plug cover (6), a through-cabin connector (1), a sealing gasket (2), a nut (3), a first sealing ring (4), and a second sealing ring (5); The through-cabin connector (1) and the plug cover (6), the sealing gasket (2), the nut (3), the first sealing ring (4), and the second sealing ring (5) are respectively sealed by end faces and sealed in radial directions to form a double-channel redundant sealing structure.

2. The redundant sealing structure for underwater long-duration engine plugging cover as claimed in claim 1, characterized in that: The blocking cover (6) has a through hole in the middle, and the semi-threaded through-cabin electrical connector (1) has two sealing grooves, namely an end face sealing groove and a radial sealing groove; The through-cabin connector (1) passes through the through hole in the middle of the blocking cover (6); the first sealing ring (4) is placed in the end face sealing groove; the second sealing ring (5) is placed in the radial sealing groove; the sealing gasket (2) is inserted into the through-cabin electrical connector (1) and fastened with a nut (3).

3. The redundant sealing structure for underwater long-duration engine plugging cover as claimed in claim 1, characterized in that: The through-cabin connector (1), the plug cover (6) and the first sealing ring (4) form an end face seal, thereby forming a single-side seal of the engine plug cover; The through-cabin connector (1) forms a radial seal with the sealing gasket (2) and the sealing ring (5), and the sealing gasket (2) forms an end face seal with the plug cover (6) and the sealing ring (4), thereby forming a seal on the other side of the engine plug cover.

4. The redundant sealing structure for underwater long-duration engine plugging cover as claimed in claim 1, characterized in that: The through-cabin connector (1) is a semi-threaded structure with a sealing groove on the end face, the column section has a sealing groove, and the rest is a threaded section, and multiple conductions are arranged inside for transmitting ignition commands.

5. The redundant sealing structure for underwater long-duration engine plugging cover as claimed in claim 1, characterized in that: The sealing gasket (2) is a structure with a sealing groove on the end face; the nut (3) is an internal thread structure, matching the thread of the through-cabin connector (1).

6. The redundant sealing structure for underwater long-duration engine plugging cover as claimed in claim 1, It is characterized in that The first sealing ring (4) and the second sealing ring (5) are both O-rings. The material is fluorosilicone rubber.

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