Spray pipe for gas generator for underwater launching

Abstract

The utility model discloses a spray pipe for a gas generator for underwater launching. The spray pipe comprises a spray pipe shell, a spray pipe lining, a throat liner and a pressure buildup assembly, wherein the spray pipe lining and the throat liner are arranged on the inner wall of the spray pipe shell, and the pressure buildup assembly is arranged at the rear end of the spray pipe shell. An annular connecting table with internal threads is arranged at the rear end of the spray pipe shell; the pressure buildup assembly comprises a pressure-bearing pressing screw, a pressure buildup diaphragm, a sealing pressing screw and a dustproof plug. The pressure-bearing pressing screw is connected to the front section of the inner wall of the annular connecting table of the spray pipe shell in a threaded mode, and the front end face of the pressure-bearing pressing screw tightly abuts against the rear end face of the throat liner. The pressure building diaphragm is placed behind the pressure-bearing pressing screw; the sealing pressing screw is connected to the rear section of the inner wall of the annular connecting table of the spray pipe shell in a threaded mode, and the front end face of the sealing pressing screw is made to press the outer ring of the pressure building diaphragm. And the dustproof plug is fixedly adhered to an inner hole of the sealing pressing screw. According to the spray pipe for the fuel gas generator, sealing can be guaranteed, and ignition pressure can be reliably established.

Description

Technical Field

[0001] The utility model relates to a nozzle for a gas generator used for underwater launching, belonging to the technical field of solid rocket engines. Background Art

[0002] A certain type of gas generator under development is used in underwater launch situations. The gas generator is required to be sealed to isolate the water medium, and it is also required to withstand a back pressure of 1 to 2 MPa, which plays a role in establishing the ignition pressure during the ignition process of the gas generator. In addition, the outer circle of the long tail nozzle of the gas generator has strict size requirements, and other external equipment and transmission mechanisms have certain requirements on the size of the fragments of the sealing structure. The conventional single sealing structure is made of polystyrene foam plastic, which has low strength and cannot withstand underwater back pressure; while the sealing cover structure made of bakelite can withstand underwater back pressure, but its fragments are large and cannot meet the performance requirements. In order to meet the above-mentioned index requirements at the same time, a sealing structure was designed and manufactured to solve the problem that the traditional sealing structure cannot meet the performance requirements. Utility Model Content

[0003] The utility model aims to solve the problem that the traditional gas generator is not suitable for underwater launching, and provides a nozzle for the gas generator used for underwater launching.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] The utility model discloses a nozzle for a gas generator for underwater launching, comprising a nozzle shell, a nozzle liner and a throat liner arranged on the inner wall of the nozzle shell, and a pressure building component arranged at the rear end of the nozzle shell;

[0006] The rear end of the nozzle housing is provided with an annular connecting platform with internal threads;

[0007] The pressure building component includes a pressure bearing screw, a pressure building diaphragm, a sealing screw and a dustproof plug;

[0008] The pressure-bearing screw and the sealing screw are both annular parts whose inner diameters match the inner diameters of the throat liner, and the outer walls of the pressure-bearing screw and the sealing screw are both processed with external threads that match the internal threads of the annular connecting platform of the nozzle housing;

[0009] The pressure-building diaphragm is a circular plate whose diameter matches the inner diameter of the annular connecting platform of the nozzle housing;

[0010] The dustproof plug is a columnar structure whose outer shape matches the inner shape of the sealing screw;

[0011] The pressure-bearing pressure screw is threadedly connected to the front section of the inner wall of the annular connecting platform of the nozzle housing, and the front end face of the pressure-bearing pressure screw is tightly pressed against the rear end face of the throat liner; the pressure-building diaphragm is placed behind the pressure-bearing pressure screw; the sealing pressure screw is threadedly connected to the rear section of the inner wall of the annular connecting platform of the nozzle housing, and the front end face of the sealing pressure screw is pressed against the outer ring of the pressure-building diaphragm; the dust-proof plug is adhered to the inner hole of the sealing pressure screw.

[0012] The inner shape of the sealing screw is a truncated cone-shaped inner hole that expands outward, so that the dustproof plug is positioned inward through the truncated cone-shaped inner hole of the sealing screw.

[0013] The pressure-building diaphragm is made of glass fiber.

[0014] A first sealing ring is installed in a groove between the front end surface of the pressure-bearing screw and the butt joint surface of the nozzle housing.

[0015] A second sealing ring is installed in a groove between the rear end surface of the pressure-bearing screw and the butt joint surface of the pressure-building diaphragm.

[0016] Working process

[0017] When the gas generator is located underwater and not working, the sealing pressure screw and the dustproof plug share the external back pressure, and the first sealing ring and the second sealing ring achieve sealing of the inner cavity of the gas generator.

[0018] After the gas generator is activated, the bearing capacity of the pressure-building diaphragm is greater than the ignition pressure of the charge, so the charge can be smoothly pressurized and ignited. When the pressure generated by the charge continues to increase, the unpressed part of the pressure-building diaphragm will rupture, and the dust-proof plug will be pushed backwards to open the gas passage.

[0019] Beneficial Effects

[0020] The gas generator nozzle of the utility model can ensure reliable sealing and be protected from seawater erosion when not working underwater, and can reliably establish ignition pressure and open smoothly after the gas generator is in operation, thereby ensuring normal operation of the gas generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the nozzle for the gas generator of the utility model;

[0022] In the figure, 1-nozzle lining, 2-nozzle shell, 3-throat lining, 4-first sealing ring, 5-pressure bearing screw, 6-second sealing ring, 7-pressure building diaphragm, 8-sealing screw, 9-dustproof plug. DETAILED DESCRIPTION

[0023] The content of the utility model is further described below in conjunction with the drawings and embodiments.

[0024] Example

[0025] like Figure 1 As shown, a nozzle for a gas generator for underwater launching of the utility model comprises a nozzle housing 2, a nozzle liner 1 and a throat liner 3 arranged on the inner wall of the nozzle housing 2, and a pressure building assembly arranged at the rear end of the nozzle housing 2;

[0026] The rear end of the nozzle housing 2 is provided with an annular connecting platform with internal threads;

[0027] The pressure building assembly includes a pressure bearing screw 5, a pressure building diaphragm 7, a sealing screw 8 and a dustproof plug 9;

[0028] The pressure-bearing screw 5 and the sealing screw 8 are both annular parts whose inner diameters match the inner diameters of the throat liner 3, and the outer walls of the pressure-bearing screw 5 and the sealing screw 8 are processed with external threads that match the internal threads of the annular connecting platform of the nozzle housing 2;

[0029] The pressure-building diaphragm 7 is a circular plate whose diameter matches the inner diameter of the annular connecting platform of the nozzle housing 2;

[0030] The dustproof plug 9 is a columnar structure whose outer shape matches the inner shape of the sealing screw 8;

[0031] The pressure-bearing screw 5 is threadedly connected to the front section of the inner wall of the annular connecting platform of the nozzle housing 2, and the front end face of the pressure-bearing screw 5 is tightly pressed against the rear end face of the throat liner 3; the pressure-building diaphragm 7 is placed behind the pressure-bearing screw 5; the sealing pressure screw 8 is threadedly connected to the rear section of the inner wall of the annular connecting platform of the nozzle housing 2, and the front end face of the sealing pressure screw 8 is pressed against the outer ring of the pressure-building diaphragm 7; the dust-proof plug 9 is adhered to the inner hole of the sealing pressure screw 8.

[0032] The pressure-building diaphragm 7 is made of glass fiber.

[0033] A first sealing ring 4 is installed in a groove between the front end surface of the pressure-bearing screw 5 and the butt joint surface of the nozzle housing 2 .

[0034] A second sealing ring 6 is installed in a groove between the rear end surface of the pressure-bearing screw 5 and the butt joint surface of the pressure-building diaphragm 7 .

[0035] The inner shape of the sealing screw 8 is a truncated cone-shaped inner hole that expands outward, so that the dustproof plug 9 is positioned inward through the truncated cone-shaped inner hole of the sealing screw 8.

[0036] When the gas generator is located underwater and not working, the sealing pressure screw 8 and the dustproof plug 9 share the external back pressure, and the first sealing ring 4 and the second sealing ring 6 achieve sealing of the inner cavity of the gas generator.

[0037] After the gas generator is activated, the bearing capacity of the pressure-building diaphragm 7 is greater than the ignition pressure of the charge, so the charge can be smoothly pressurized and ignited. When the pressure generated by the charge continues to increase, the unpressed part of the pressure-building diaphragm 7 will rupture, and the dust-proof plug 9 will be pushed backwards to open the gas passage.

Claims

1. A nozzle for a gas generator for underwater launching, comprising a nozzle housing, a nozzle liner and a throat liner arranged on the inner wall of the nozzle housing, characterized in that: Also included is a pressure building assembly disposed at the rear end of the nozzle housing; The rear end of the nozzle housing is provided with an annular connecting platform with internal threads; The pressure building component includes a pressure bearing screw, a pressure building diaphragm, a sealing screw and a dustproof plug; The pressure-bearing screw and the sealing screw are both annular parts whose inner diameters match the inner diameters of the throat liner, and the outer walls of the pressure-bearing screw and the sealing screw are both processed with external threads that match the internal threads of the annular connecting platform of the nozzle housing; The pressure-building diaphragm is a circular plate whose diameter matches the inner diameter of the annular connecting platform of the nozzle housing; The dustproof plug is a columnar structure whose outer shape matches the inner shape of the sealing screw; The pressure-bearing pressure screw is threadedly connected to the front section of the inner wall of the annular connecting platform of the nozzle housing, and the front end face of the pressure-bearing pressure screw is tightly pressed against the rear end face of the throat liner; the pressure-building diaphragm is placed behind the pressure-bearing pressure screw; the sealing pressure screw is threadedly connected to the rear section of the inner wall of the annular connecting platform of the nozzle housing, and the front end face of the sealing pressure screw is pressed against the outer ring of the pressure-building diaphragm; the dust-proof plug is adhered to the inner hole of the sealing pressure screw.

2. A nozzle for a gas generator for underwater launching as claimed in claim 1, characterized in that: The inner shape of the sealing screw is a truncated cone-shaped inner hole that expands outward, so that the dustproof plug is positioned inward through the truncated cone-shaped inner hole of the sealing screw.

3. A nozzle for a gas generator for underwater launching as claimed in claim 1 or 2, characterized in that: The pressure-building diaphragm is made of glass fiber.

4. A nozzle for a gas generator for underwater launching as claimed in claim 1 or 2, characterized in that: A first sealing ring is installed in a groove between the front end surface of the pressure-bearing screw and the butt joint surface of the nozzle housing.

5. A nozzle for a gas generator for underwater launching as claimed in claim 1 or 2, characterized in that: A second sealing ring is installed in a groove between the rear end surface of the pressure-bearing screw and the butt joint surface of the pressure-building diaphragm.

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