Water pressure testing device for fixed shell of solid rocket engine jet pipe

Abstract

The utility model relates to a water pressure testing device for a fixed shell of a jet pipe of a solid rocket engine, which comprises a water inlet, a fastener, a water pressure testing container, a connecting bolt, a flat plate, a piston cylinder, a simulation male ball, a fixed shell and a pressure sensor, establishing a fixed shell water pressure checking pressure intensity based on the maximum working pressure intensity of the solid rocket engine; the fixed shell is fixedly connected with the hydrostatic test container through a fastener; the flat plate is fixedly connected with the simulation male ball through a connecting bolt; the simulation male ball is matched with the fixed shell, so that the sealing performance and load bearing of the fixed shell are realized; and the piston cylinder is firmly connected with the hydrostatic test container, so that the isolation of the load in the fixed shell container is realized, and the over-examination of the fixed shell is avoided. According to the utility model, the load which does not exist in the middle of the fixed shell is unloaded, examination is carried out according to the designed real load, over-examination is avoided, and the accurate design of the spray pipe is ensured.

Description

Technical Field

[0001] The utility model relates to the field of solid rocket motor nozzle bearing performance inspection, in particular to a water pressure inspection device for a solid rocket motor nozzle fixing shell. Background Art

[0002] The nozzle fixing shell is the main load-bearing component of the solid rocket motor nozzle. It is usually located outside the nozzle convergent section and is butted with the combustion chamber shell. Its bearing performance is an important index of the nozzle. In order to evaluate its performance, a water pressure test of the fixing shell is usually carried out before the product is delivered. However, the existing test methods generally have over-verification. When the nozzle design index is not strict, the design margin of the fixing shell is large. In the state of over-verification water pressure test, the fixing shell can still pass the test, and the fixing shell will not deform. On the contrary, in the state of over-verification water pressure test, the fixing shell cannot pass the conventional water pressure test, and the fixing shell will have a large deformation.

[0003] The existing water pressure test methods for the nozzle fixing shell generally adopt direct butt joint of the water pressure plug cover and the nozzle fixing shell for the water pressure test. This method cannot accurately evaluate the bearing capacity of the fixing shell, and generally has over-verification. It is easy to cause large deformation of the fixing shell, which cannot pass the verification test and results in the scrapping of the fixing shell. Summary of the Invention

[0004] The utility model provides a water pressure inspection device for a solid rocket motor nozzle fixing shell to solve the problems that the existing inspection methods cannot accurately evaluate the bearing capacity of the fixing shell, have over-verification, are easy to cause large deformation of the fixing shell, cannot pass the verification test, and result in the scrapping of the fixing shell.

[0005] To solve the above technical problems, one of the purposes of the utility model is to propose a water pressure inspection device for a solid rocket motor nozzle fixing shell, including: a water inlet 1, a fastener 2, a first sealing ring 3, a water pressure test container 4, a connecting bolt 5, a flat plate 6, a piston cylinder 8, a simulated male ball 9, a fixing shell 10 and a pressure sensor. The water inlet 1 is opened on the water pressure test container 4 to establish the water pressure verification pressure of the fixing shell 10. A first sealing ring 3 is arranged between the fixing shell 10 and the water pressure test container 4 to ensure the sealing performance during the water pressure test of the fixing shell. The fixing shell 10 is fixedly connected with the water pressure test container 4 through the fastener 2. The flat plate 6 is fixedly connected with the simulated male ball 9 through the connecting bolt 5. The cooperation between the simulated male ball 9 and the fixing shell 10 realizes the sealing performance and load bearing of the fixing shell. The piston cylinder 8 is fixedly connected with the water pressure test container 4 by welding, realizing the unloading of the middle load of the fixing shell.

[0006] Further, the hydrostatic test device further includes a third sealing ring 11, and the third sealing ring 11 is arranged between the fixed housing 10 and the simulated male ball 9 to ensure the sealing performance during the hydrostatic test of the fixed housing.

[0007] Further, the hydrostatic test device further includes a second sealing ring 7, and the second sealing ring 7 is arranged between the piston cylinder 8 and the simulated male ball 9 to ensure the sealing performance during the hydrostatic test of the fixed housing.

[0008] Further, the flat plate 6 presses on the piston cylinder 8 and is not fixedly connected to the piston cylinder 8.

[0009] Further, the flat plate 6 restricts the translation between the flat plate and the piston cylinder through a straight port, and the flat plate can only move axially on the piston cylinder.

[0010] Further, two pressure measurement holes are opened on the hydrostatic test container 4, and two pressure sensors are connected to realize redundant testing of the bearing pressure of the fixed housing during the test, ensuring reliable acquisition of the bearing pressure data of the fixed housing during the test.

[0011] Further, the pressure measurement hole and the water inlet can be the same channel.

[0012] One or more of the above technical solutions of the present utility model at least have one or more of the following technical effects:

[0013] A method for applying a hydrostatic real load loading test to a nozzle fixed housing of the present utility model, which is fully evaluated according to the designed real load, avoids over-evaluation, and ensures the precise design of the nozzle;

[0014] The present utility model does not directly dock the conventional hydrostatic plug with the fixed housing, but uses a piston cylinder to remove the non-existent load of the fixed housing, and at the same time uses a simulated male ball to simulate the formal load loading, realizing the hydrostatic real load loading test of the nozzle fixed housing. Description of the Drawings

[0015] Figure 1 : Schematic diagram of a hydrostatic test device for a nozzle fixed housing of a solid rocket motor;

[0016] Wherein: 1 - water inlet or pressure measurement port, 2 - fastener, 3 - first sealing ring, 4 - hydrostatic test container, 5 - connecting bolt, 6 - flat plate, 7 - second sealing ring, 8 - piston cylinder, 9 - simulated male ball, 10 - fixed housing, 11 - third sealing ring. Detailed Embodiment

[0017] A hydrostatic test device for the nozzle fixing housing of a solid rocket motor is applied to the verification of the hydrostatic bearing performance test of the fixing housing with relatively small design margin under the condition of strict nozzle design indicators. Instead of directly docking the traditional hydrostatic plug with the fixing housing, this utility model adopts a simulated male ball and a piston cylinder to dock with it. This method removes the load that actually does not exist in the middle of the fixing housing, so as to ensure that the loading pressure of the fixing housing is the actual maximum load during the engine operation process. Under the condition of strict nozzle design requirements, the performance of the fixing housing product can be detected by this method. The tooling realized by this method mainly includes: a hydrostatic test container, a sealing ring, a flat plate, a piston cylinder, and a simulated male ball. Through the cooperation of the hydrostatic test container and the piston cylinder, the load that actually does not exist in the middle of the fixing housing is removed, and the assessment is carried out according to the designed real load, avoiding over-assessment and ensuring the accurate design of the nozzle.

[0018] Combined with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the present utility model.

[0019] As shown in the attached Figure 1 figures, the hydrostatic test device for the nozzle fixing housing of a solid rocket motor is composed of a water inlet, a pressure measuring port, fasteners, sealing rings, a hydrostatic test container, connecting bolts, a flat plate, a piston cylinder, a simulated male ball, a fixing housing, etc.

[0020] The fixing housing is connected to the base of the hydrostatic test container through connecting bolts and sealing rings; the sealing performance and load bearing of the fixing housing are realized through the cooperation between the simulated male ball and the fixing housing, and the inner diameter of the simulated male ball is obtained through calculation; the unloading of the middle load of the fixing housing is realized through the welded connection between the piston cylinder and the hydrostatic test container; the simulated male ball is reliably fixed by the flat plate; during the test loading process, the simulated male ball can automatically move upward under the action of the load, and the flat plate is not fixedly connected to the piston cylinder. The flat plate restricts the translation between the flat plate and the piston cylinder through a straight port, and the flat plate can only move axially in the piston cylinder.

[0021] By opening two pressure measurement holes on the base of the fixed shell hydrostatic test device and connecting two pressure sensors, redundant testing of the bearing pressure of the fixed shell during the test is achieved to ensure reliable acquisition of the bearing pressure data of the fixed shell; by opening a water inlet on the base of the fixed shell hydrostatic test device, the hydrostatic test pressure of the fixed shell is established; the fixed shell and the hydrostatic test container are reliably connected through the connecting bolts between them, and the sealing performance during the hydrostatic test of the fixed shell is ensured through the sealing rings between them; among them, through the cooperation of the hydrostatic test container and the piston cylinder, the load that actually does not exist in the middle of the fixed shell is removed, and the assessment is carried out according to the designed real load, avoiding over-assessment and ensuring the precise design of the nozzle.

[0022] The method and process of the nozzle shell hydrostatic test are as follows: assemble as shown in the appendix Figure 1 Open two pressure measurement holes on the base of the fixed shell hydrostatic test device, and connect two pressure sensors to achieve redundant testing of the bearing pressure of the fixed shell during the test.

[0023] Ensure reliable acquisition of the bearing pressure data of the fixed shell. By opening a water inlet on the base of the fixed shell hydrostatic test device, the hydrostatic test pressure of the fixed shell is established; assemble the flat plate, the simulated male ball and the fixed shell with the test container as shown in the figure, ensure there is enough clearance between the simulated male ball and the flat plate so that the simulated male ball can move freely along the piston cylinder under the action of water pressure, and through the sealing rings between the piston cylinder and the simulated male ball and between the simulated male ball and the fixed shell, the overall structure is kept sealed. The fixed shell and the hydrostatic test container are reliably connected through the connecting bolts between them, and the sealing performance during the hydrostatic test of the fixed shell is ensured through the sealing rings between them. Then use a high-pressure water pump to pressurize the container through the water injection port until the pressure in the container reaches the target pressure. In this way, through the cooperation of the hydrostatic test container and the piston cylinder, the load that actually does not exist in the middle of the fixed shell is removed, and the assessment is carried out according to the designed real load, so that the fixed shell has been reasonably assessed for the bearing pressure and over-assessment is avoided.

[0024] The utility model has passed the hydrostatic test of the fixed shell of a certain type of solid rocket engine nozzle and has been examined by hot firing. The method of the hydrostatic test of the fixed shell of this nozzle can effectively solve the realization of the true load assessment of the fixed shell of the nozzle, ensure the test assessment accuracy, and ensure the reliability of the model development.

[0025] Although the preferred embodiments of the utility model have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model.

[0026] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present utility model without departing from the spirit and scope of the embodiments of the present utility model. Thus, if these modifications and variations of the embodiments of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A hydrostatic test device for the nozzle fixing housing of a solid rocket motor, characterized in that, Comprising: An inlet (1), a fastener (2), a first sealing ring (3), a hydrostatic test container (4), a connecting bolt (5), a flat plate (6), a piston cylinder (8), a simulated male ball (9), a fixed housing (10) and a pressure sensor. The inlet (1) is opened on the hydrostatic test container (4) to establish the hydrostatic test pressure of the fixed housing (10), and the test pressure is the maximum operating pressure of the solid rocket motor. A first sealing ring (3) is provided between the fixed housing (10) and the hydrostatic test container (4) to ensure the sealing performance between the fixed housing and the hydrostatic test container, thereby ultimately ensuring the sealing performance during the hydrostatic test of the fixed housing. Two second sealing rings (7) are provided between the piston cylinder (8) and the simulated male ball (9) to ensure the sealing performance between the piston cylinder and the simulated male ball, thereby ultimately ensuring the sealing performance during the hydrostatic test of the fixed housing. Two third sealing rings (11) are provided between the simulated male ball (9) and the fixed housing (10) to ensure the sealing performance between the simulated male ball and the fixed housing, thereby ultimately ensuring the sealing performance during the hydrostatic test of the fixed housing. The fixed housing (10) is fixedly connected to the hydrostatic test container (4) through the fastener (2). The flat plate (6) is fixedly connected to the simulated male ball (9) through the connecting bolt (5). The cooperation between the simulated male ball (9) and the fixed housing (10) realizes the sealing performance and load bearing of the fixed housing. The piston cylinder (8) is firmly connected to the hydrostatic test container (4), realizing the isolation of the load in the fixed housing container, thereby avoiding over-testing of the fixed housing.

2. The hydrostatic test device for the nozzle fixing housing of a solid rocket motor according to claim 1, wherein: The flat plate (6) presses on the piston cylinder (8) and is not fixedly connected to the piston cylinder (8).

3. The hydrostatic test device for the nozzle fixing housing of a solid rocket motor according to claim 2, characterized in that: The flat plate (6) restricts the translation between the flat plate and the piston cylinder through a straight port, and the flat plate can only move axially on the piston cylinder.

4. The hydrostatic test device for the nozzle fixed housing of a solid rocket motor according to claim 1, characterized in that: Two pressure measurement holes are opened on the hydrostatic test container (4), and two pressure sensors are connected to realize redundant testing of the test bearing pressure of the fixed housing, ensuring reliable acquisition of the test bearing pressure data of the fixed housing.

5. The hydrostatic test device for the nozzle fixed housing of a solid rocket motor according to claim 4, characterized in that: The pressure measurement hole and the inlet are the same channel.

6. The hydrostatic test device for the nozzle fixed housing of a solid rocket motor according to claim 1, characterized in that: The piston cylinder (8) is fixedly connected to the hydrostatic test container (4) by bolts.

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