A working pressure testing device for a small gas generator

Abstract

A working pressure testing device for a small gas generator belongs to the technical field of gas generator acceptance and testing. The invention includes a gas generator, a three-way pipeline, a copper gasket, a secondary nozzle, and a ground generator. The gas outlet of the gas generator is connected to the inlet of the three-way pipeline, the secondary nozzle is installed at the outlet of the three-way pipeline, a pressure measuring port is provided on the three-way pipeline, which can be used to measure the pressure inside the three-way pipeline, and the ground generator is mainly used to determine the relationship between the pressure inside the three-way pipeline and the pressure inside the gas generator. When the gas generator is working, gas flows into the test pipeline and then is discharged through the secondary nozzle. Due to the effect of the secondary nozzle, a certain pressure is formed inside the three-way pipeline, and the pressure inside the three-way pipeline can be measured. Finally, the working pressure in the combustion chamber of the generator can be indirectly obtained by using the relationship between the pressure inside the three-way pipeline and the pressure inside the gas generator.

Description

Technical Field

[0001] The present invention relates to a working pressure testing device for a small gas generator, belonging to the technical field of gas generator acceptance and testing. Background Art

[0002] Gas generators have the advantages of simple structure, short dynamic response time, high reliability, and long-term storage, so they are widely used in various industries such as national defense, aerospace, and automobiles. Working pressure is a key performance of gas generators, and its performance level directly affects the use of gas generators. In order to ensure the quality of gas generator products, it is necessary to test the working pressure when leaving the factory. However, for small gas generators, due to limited structural space, pressure measurement interfaces are often not provided in the formal products. Therefore, it is impossible to test the working pressure of the formal products during the product acceptance process. For this situation, ground generators of the same batch with pressure measurement interfaces are usually used to replace the acceptance of actual products. However, due to the differences in production batches and structures between ground generators and actual generators, the test results cannot reflect the actual performance level of the products to be delivered. Therefore, it is necessary to design a device that can directly perform pressure testing and acceptance on gas generator products. Summary of the Invention

[0003] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, providing a working pressure testing device for a small gas generator, which has a simple structure, few components, and high reliability, and is applicable to testing the internal working pressure of gas generators without pressure measurement interfaces.

[0004] The technical solution of the present invention is: a working pressure testing device for a small gas generator, including a gas generator, a three-way pipeline, a secondary nozzle, and a ground generator;

[0005] The gas outlet of the gas generator is connected to the inlet of the three-way pipeline; the secondary nozzle is installed at the outlet of the three-way pipeline for forming a certain pressure in the three-way pipeline;

[0006] A pressure measurement port is provided on the three-way pipeline for testing the pressure inside the three-way pipeline;

[0007] A pressure measurement hole is provided on the ground generator for measuring the internal pressure of the ground generator; the gas outlet of the ground generator is connected to the inlet of the three-way pipeline for determining the relationship between the pressure in the three-way pipeline and the internal pressure of the ground generator. Then, after replacing the ground generator with a gas generator, the internal pressure of the gas generator is calculated according to the relationship and the pressure in the three-way pipeline measured at the pressure measurement port.

[0008] Further, it also includes a copper gasket; the copper gasket is installed at the connection between the secondary nozzle and the tee pipeline for sealing between the secondary nozzle and the tee pipeline.

[0009] Further, the material of the copper gasket is T2-m material after annealing treatment.

[0010] Further, the outlet of the gas generator is threadedly connected to the inlet of the tee pipeline, and raw tape is wound on the thread before tightening to ensure the sealing inside the tee pipeline.

[0011] Further, the pressure measuring port is a threaded structure for connecting a pressure sensor.

[0012] Further, the processing method of the pressure measuring port of the tee pipeline is welding.

[0013] Further, the secondary nozzle is threadedly connected to the tee pipeline..

[0014] Further, the throat diameter of the secondary nozzle can be adjusted as needed, and the pressure inside the tee pipeline is controlled by adjusting the throat diameter.

[0015] The advantages of the present invention compared with the prior art are as follows:

[0016] 1. When accepting the working pressure performance of the gas generator product of the present invention, it is not necessary to separately produce a ground generator for testing. Instead, it can be directly extracted from the product and this testing device can be installed for acceptance, so that the performance of the sampled product can better represent the performance of the delivered product.

[0017] 2. The relationship between the pressure inside the tee pipeline and the pressure inside the gas generator of the present invention is obtained through actual tests of the ground generator, and the conversion relationship is accurate, and the characterization accuracy of the test results is relatively high.

[0018] 3. The testing device of the present invention has a simple structure, few components, light weight, and high reliability, and can meet the requirements for testing the pressure of the gas generator. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a small gas generator working pressure testing device.

[0020] Figure 2 and Figure 3 is a schematic diagram comparing the product structures of the gas generator and the ground generator

[0021] Figure 4 and Figure 5 is a schematic structural diagram of the ground generator test device when determining the relationship between the pipeline pressure and the internal working pressure of the gas generator.

[0022] In the figure, 1 is a gas generator; 2 is a three-way pipeline; 3 is a copper gasket; 4 is a secondary nozzle; 5 is a ground generator Detailed implementation manner

[0023] The present invention will be further explained and described below in conjunction with the accompanying drawings of the specification and the detailed implementation manner.

[0024] A working pressure testing device for a small gas generator 1 includes a gas generator 1, a three-way pipeline 2, a secondary nozzle 4, a copper gasket 3 and a ground generator 5. The ground generator 5 is mainly used to determine the relationship between the pressure in the three-way pipeline 2 and the internal pressure of the gas generator 1. When the gas generator 1 is working, high-temperature gas flows into the three-way pipeline 2 and then is discharged through the secondary nozzle 4. Due to the action of the secondary nozzle 4, a certain pressure is formed in the test pipeline, and the pressure inside the three-way pipeline 2 can be measured. Finally, the working pressure in the combustion chamber of the generator can be indirectly obtained by using the relationship between the pressure in the three-way pipeline 2 and the internal pressure of the gas generator 1.

[0025] The small gas generator 1 is a low combustion temperature generator, with an internal theoretical combustion temperature of 1400K, no metal components in the gas, and a working time ≤ 4s.

[0026] The three-way pipeline 2 is made of common stainless steel material. Its inlet is connected to the gas outlet of the gas generator 1 by threads and sealed by winding raw material tape. The outlet of the three-way pipeline 2 is used to connect the secondary nozzle 4. A pressure measuring port is welded on the three-way pipeline 2, which can be connected to a pressure measuring sensor to measure the pressure inside the three-way pipeline 2.

[0027] The secondary nozzle 4 is made of common stainless steel material. The pressure inside the three-way pipeline 2 can be controlled by adjusting the throat diameter of the secondary nozzle 4. The secondary nozzle 4 is connected to the three-way pipeline 2 by threads.

[0028] The copper gasket 3 is made of common material T2-m and is annealed to ensure the seal between the secondary nozzle 4 and the three-way pipeline 2.

[0029] The ground generator 5 and the gas generator 1 only have a pressure measuring hole added on the shell, and the rest of the structures are the same.

[0030] Figure 1In this invention, it includes a small gas generator 1, a three-way pipeline 2, a copper gasket 3, and a secondary nozzle 4. The small gas generator should be a low combustion temperature generator, with the internal theoretical combustion temperature less than 1400K, the gas having no metal components, the working time ≤ 4s. The gas outlet of the small gas generator 1 is connected to the three-way pipeline by a thread and sealed with raw tape. The secondary nozzle 4 is connected to the three-way pipeline 2 by a thread and sealed with a copper gasket 4. A pressure measurement port is welded in the middle of the three-way pipeline 2 for measuring the pressure inside the three-way pipeline 2. When the ignition signal is received, the gas generator 1 operates rapidly, the generated gas flows into the three-way pipeline 2 and is discharged through the secondary nozzle 4. The setting of the secondary nozzle 4 causes a low-pressure area to form inside the three-way pipeline 2, and the pressure of the low-pressure area can be obtained by measuring the three-way pipeline 2.

[0031] Figure 2 、 3 In this case, the ground generator 5 has an additional pressure measurement hole on the housing. After installing a pressure sensor, it can be used to measure the working pressure inside the gas generator 1.

[0032] Figure 4 、 5 In this case, during the test of the ground generator 5, a test structure connecting the three-way pipeline 2 and the secondary nozzle 4 is connected at the gas outlet, and the corresponding relationship between the pressure inside the three-way pipeline 2 and the working pressure inside the gas generator 1 can be obtained simultaneously.

[0033] The working principle of this invention is as follows:

[0034] When testing the working pressure of the gas generator 1 product, it is connected as per Figure 1 . After the gas generator 1 operates, the pressure inside the three-way pipeline 2 can be measured by the pressure sensor on the three-way pipeline 2. Then, based on the corresponding relationship between the pressure inside the three-way pipeline 2 and the working pressure inside the combustion chamber determined by Figure 3 , the pressure measured inside the three-way pipeline 2 is converted to obtain the working pressure inside the gas generator 1, so as to determine whether the working pressure of the gas generator 1 meets the product's index requirements. When the gas generator 1 operates, the gas flows into the test pipeline and is then discharged through the secondary nozzle 4. Due to the effect of the secondary nozzle 4, a certain pressure is formed inside the three-way pipeline 2, and the pressure inside the three-way pipeline 2 can be measured. Finally, the working pressure inside the combustion chamber of the generator can be indirectly obtained by using the relationship between the pressure inside the three-way pipeline 2 and the pressure inside the gas generator 1.

[0035] The content not described in detail in the specification of this invention belongs to the well-known technology of those skilled in the art.

Claims

1. A working pressure testing device for a small gas generator, characterized in that: It includes a gas generator (1), a three-way pipeline (2), a secondary nozzle (4) and a ground generator (5); The gas outlet of the gas generator (1) is connected to the inlet of the three-way pipeline (2); the secondary nozzle (4) is installed at the outlet of the three-way pipeline (2) and is used to form a certain pressure in the three-way pipeline (2); A pressure measuring port is provided on the three-way pipeline (2) and is used to measure the pressure inside the three-way pipeline (2); A pressure measuring hole is provided on the ground generator (5) and is used to measure the internal pressure of the ground generator (5); the gas outlet of the ground generator (5) is connected to the inlet of the three-way pipeline (2) and is used to determine the relationship between the pressure in the three-way pipeline (2) and the internal pressure of the ground generator (5). Then, after replacing the ground generator (5) with the gas generator (1), when the gas generator (1) works, the gas flows into the test pipeline and then is discharged through the secondary nozzle (4). Due to the action of the secondary nozzle (4), a certain pressure is formed in the three-way pipeline (2), and the pressure inside the three-way pipeline (2) can be measured. Finally, the working pressure in the combustion chamber of the generator is indirectly obtained by using the relationship between the pressure in the three-way pipeline (2) and the internal pressure of the gas generator (1); the processing method of the pressure measuring port of the three-way pipeline (2) is welding; The throat diameter of the secondary nozzle (4) can be adjusted as needed, and the pressure in the three-way pipeline (2) is controlled by adjusting the throat diameter.

2. The working pressure testing device for a small gas generator according to claim 1, characterized in that: It also includes a copper gasket (3); the copper gasket (3) is installed at the connection between the secondary nozzle (4) and the three-way pipeline (2) and is used for the seal between the secondary nozzle (4) and the three-way pipeline (2).

3. The working pressure testing device for a small gas generator according to claim 2, characterized in that: The material of the copper gasket (3) is T2-m material after annealing treatment.

4. A working pressure testing device for a small gas generator according to claim 1, characterized in that: The outlet of the gas generator (1) is threadedly connected to the inlet of the three-way pipeline (2), and raw tape is wound on the thread before tightening to ensure the sealing inside the three-way pipeline (2).

5. A working pressure testing device for a small gas generator according to claim 1, characterized in that: The pressure measuring port is a threaded structure and is used to connect a pressure sensor.

6. The working pressure testing device for a small gas generator according to claim 1, characterized in that: The secondary nozzle (4) is threadedly connected to the three-way pipeline (2).

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