Pressure container

Abstract

The utility model provides a pressure vessel which is applied to the performance test of a gas generator, the pressure vessel comprises a cylinder body, an explosion-proof cover matched with the cylinder body and a flexible air bag arranged in the cylinder body, the circumferential edge of the flexible air bag is fixed at the joint between the cylinder body and the explosion-proof cover, and the flexible air bag is arranged in the cylinder body. A cooling pipeline is arranged in the cylinder body, the cooling pipeline is spirally wound along the circumferential inner wall of the cylinder body to form a spiral body, the total height of the spiral body accounts for 60%-80% of the total height of the cylinder body, and the included angle between the spiral line of the spiral body and the axis of the cylinder body is 15-35 degrees. According to the utility model, the flexible air bag is arranged in the cylinder body to simulate the dynamic change of the volume and the internal pressure of the air bag in the actual working process of the safety air bag, so that the collected pressure curve is closer to the reality; the cooling pipeline is arranged in the cylinder body, so that the temperature in the accommodating cavity is effectively reduced, the temperature stability of a test environment is ensured, and the consistency and reliability of test data are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas generator performance test, especially relates to a pressure container. BACKGROUND

[0002] The gas generator is the core component of the vehicle safety air bag, and the accurate test of its performance is the necessary prerequisite for ensuring the normal work of the safety air bag at the critical moment of vehicle accident to reduce the accident injury.

[0003] At present, the performance of the gas generator is mainly tested by the method of point explosion in the fixed volume pressure container, specifically, the gas generator to be tested is installed at a specific position inside the pressure container, and a pressure sensor and other measuring devices for collecting pressure data are arranged on the pressure container, when testing, the gas generator ignition device is started to make it point explosion, at the moment of point explosion, the gas generator rapidly releases gas, the gas diffuses in the fixed volume pressure container, the pressure sensor starts to collect pressure data and transmits the data to the data acquisition system, after the test is completed, the performance of the gas generator is evaluated by analyzing the data curve exported by the data acquisition system.

[0004] However, the pressure container test environment has fixed volume and cannot simulate the dynamic changes of the air bag bag volume and internal pressure in the actual safety air bag working process, and the heat will gather in the container when the gas generator is exploded in the pressure container, with the increase of test times, the temperature in the container continues to rise, the test pressure curves of the same batch of gas generators are significantly different, which leads to the lack of consistency and comparability of different test data, and it is difficult to evaluate the performance consistency of the batch products. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a pressure container, which aims at solving the technical problems that the pressure container test environment has fixed volume and cannot simulate the dynamic changes of the air bag bag volume and internal pressure in the actual safety air bag working process in the prior art, and the temperature of the pressure container is increased by multiple batches of tests, and the collected test data lacks consistency and comparability.

[0006] The utility model discloses a pressure vessel for the performance test of the gas generator, which comprises a cylinder body, an explosion-proof cover matched with the cylinder body and a flexible air bag arranged in the cylinder body.

[0007] Compared with the prior art, the pressure vessel has the following beneficial effects: by arranging the flexible air bag in the cylinder body to simulate the dynamic change of the air bag volume and the internal pressure in the actual safety air bag working process, the collected pressure curve is closer to the actual situation, and the accuracy of the test result is greatly improved; by arranging the cooling pipeline in the cylinder body, the cooling pipeline is spirally wound along the circumferential inner wall of the cylinder body, when the heat of the gas generator is gathered, the cooling liquid in the cooling pipeline carries away the heat through circulation, effectively reduces the temperature in the containing cavity, ensures the stability of the test environment temperature, reduces the test data deviation caused by temperature fluctuation and improves the consistency and reliability of the test data.

[0008] In addition, the pressure vessel according to the utility model has the following additional technical features.

[0009] Further, in the axial direction of the cylinder body, the winding density of the spiral body is consistent.

[0010] Further, in the axial direction of the cylinder body, the winding density of the spiral body gradually decreases from the bottom of the cylinder body to the top of the cylinder body.

[0011] Further, the liquid inlet end of the cooling pipeline is arranged adjacent to the top port of the cylinder body, the liquid outlet end of the cooling pipeline is arranged adjacent to the bottom edge of the cylinder body, and the liquid inlet end and the liquid outlet end are arranged on two opposite sides of the cylinder body respectively.

[0012] Further, the liquid inlet end and the liquid outlet end of the cooling pipeline are respectively provided with connecting heads, the connecting heads are used for connecting the cooling pipeline and an external pipeline, a plurality of clamping protrusions are arranged on the circumferential outer wall of the connecting head at intervals, and the outer diameter of the connecting head gradually decreases outward from one end of the connecting head connected with the cooling pipeline along the axial direction of the connecting head.

[0013] Further, a mounting bracket is arranged on the inner bottom wall of the cylinder body, the mounting bracket is used for mounting the gas generator, and the gas outlet hole of the gas generator is arranged towards the top port of the cylinder body.

[0014] Further, at least two pressure sensor interfaces are arranged on the side wall of the cylinder body, and the pressure sensor interfaces are arranged along the axial direction of the cylinder body.

[0015] Further, a temperature sensor interface, an air bag point explosion wire harness interface and an exhaust valve interface are arranged on the side wall of the cylinder body.

[0016] Further, a plurality of first exhaust holes are arranged on the top of the explosion-proof cover, and a plurality of second exhaust holes are arranged on the circumferential side wall of the explosion-proof cover. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the pressure container of the utility model;

[0018] Figure 2 It is a structural schematic view of the cylinder body in the pressure container of the utility model;

[0019] Figure 3 It is a structural schematic view of the cooling pipeline in the pressure container of the utility model;

[0020] Figure 4 It is a state schematic view of the gas generator in the pressure container of the utility model before testing;

[0021] Figure 5 It is a state schematic view of the gas generator in the pressure container of the utility model when testing.

[0022] Wherein, the above-mentioned drawings include the following reference signs: 10-cylinder body; 11-mounting support; 20-explosion-proof cover; 201-first exhaust hole; 202-second exhaust hole; 30-flexible air bag; 40-gas generator; 51-cooling pipeline; 511-liquid inlet end; 512-liquid outlet end; 52-connection head; 521-clamping protrusion; 61-pressure sensor interface; 62-temperature sensor interface; 63-air bag point explosion wire harness interface; 64-exhaust valve interface.

[0023] The following specific embodiments will further illustrate the utility model in combination with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The drawings show several embodiments of the utility model. However, the utility model can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right" and similar terms are used for explanation purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] Referring to Figures 1 to 5 , a pressure container of the present application is shown, which is applied to performance test of a gas generator 40. The pressure container comprises a cylinder body 10, an explosion-proof cover 20 matched with the cylinder body 10, and a flexible air bag 30 arranged inside the cylinder body 10. The explosion-proof cover 20 is arranged on the top of the cylinder body 10 and forms a containing cavity together with the cylinder body 10. The flexible air bag 30 is arranged in the containing cavity. The circumferential edge of the flexible air bag 30 is fixed between the connection of the cylinder body 10 and the explosion-proof cover 20. The flexible air bag 30 is made of high polymer material consistent with the actual air bag permeability. In the embodiment, the flexible air bag 30 is of complete type without opening. In other embodiments, air exhaust holes can be arranged on the surface of the flexible air bag 30 according to the size, number and distribution parameters of the actual safety air bag exhaust holes. By simulating the air permeability and air exhaust process of the actual air bag, the problem that the dynamic changes of the air bag volume and internal pressure during the working process of the actual safety air bag cannot be simulated due to the fixed volume of the test environment of the pressure container in the prior art is effectively solved, and the precise evaluation of the performance of the gas generator 40 is realized.

[0028] As a specific example, in the embodiment, a plurality of clamping hooks are arranged on the circumferential outer wall of the top of the cylinder body 10 at intervals. A plurality of clamping blocks are arranged on the circumferential outer wall of the bottom of the explosion-proof cover 20 at intervals. A clamping groove matched with the clamping hook is arranged on the clamping block. The fixed connection between the explosion-proof cover 20 and the cylinder body 10 is realized by clamping the clamping hooks and the clamping blocks. More specifically, the circumferential edges of the top of the cylinder body 10 and the bottom of the explosion-proof cover 20 in the embodiment respectively extend outward along the radial direction of the cylinder body 10 or the explosion-proof cover 20 to form annular abutting portions. When the explosion-proof cover 20 is arranged on the top of the cylinder body 10, the circumferential edge of the flexible air bag 30 is fixed between the abutting surfaces of the two annular abutting portions, so that the fixation of the flexible air bag 30 in the cylinder body 10 is realized.

[0029] Further, the inner bottom wall of the cylinder body 10 is provided with a mounting bracket 11 for mounting the gas generator 40, and the gas outlet of the gas generator 40 is arranged towards the top port of the cylinder body 10. In actual use, when the flexible air bag 30 is in a natural state, the flexible air bag 30 is concave and covers the upper surface of the gas generator 40; when the flexible air bag 30 is in an inflated state, the flexible air bag 30 is convex and fits the top of the accommodating cavity.

[0030] Further, the side wall of the cylinder body 10 is provided with at least two pressure sensor interfaces 61 for connecting pressure sensors, and the pressure sensor interfaces 61 are arranged at intervals along the axial direction of the cylinder body 10 to facilitate the acquisition of pressure data at different positions in the accommodating cavity. In actual use, through the electrical connection between the pressure sensors and an external data acquisition system, the dynamic acquisition of pressure data changing with the inflation of the flexible air bag 30 in the accommodating cavity is realized, so that the final pressure curve is closer to the actual pressure curve of the air bag point explosion process, and the precision of the simulation model is significantly improved.

[0031] Further, the side wall of the cylinder body 10 is also provided with a temperature sensor interface 62, an air bag point explosion wire harness interface 63 and an exhaust valve interface 64. The temperature sensor interface 62 is used to accurately access a temperature sensor to monitor the temperature change in the accommodating cavity in real time; the air bag point explosion wire harness interface 63 is used to ensure the smooth access of the point explosion wire harness to ensure that the gas generator 40 can be normally triggered; and the exhaust valve interface 64 is used to connect an exhaust valve to maintain the stability of the pressure in the accommodating cavity.

[0032] Further, the top of the explosion-proof cover 20 is provided with a plurality of first exhaust holes 201, and the circumferential side wall of the explosion-proof cover 20 is provided with a plurality of second exhaust holes 202. In this embodiment, the first exhaust holes 201 are circular holes, and a plurality of first exhaust holes 201 are arranged in a circular array on the top of the explosion-proof cover 20 to remove the excess air between the inner wall of the explosion-proof cover 20 and the flexible air bag 30 during the point explosion process of the gas generator 40; the second exhaust holes 202 are triangular or rhombic hole structures, and a plurality of second exhaust holes 202 are uniformly and spacedly arranged on the circumferential side wall of the explosion-proof cover 20 away from the cylinder body 10 to assist in removing the excess air between the inner wall of the explosion-proof cover 20 and the flexible air bag 30 during the point explosion process of the gas generator 40.

[0033] The cylinder 10 in the application is provided with a cooling pipeline 51, which is spirally wound along the circumferential inner wall of the cylinder 10 to form a spiral body, the total height of the spiral body accounts for 60%-80% of the total height of the cylinder 10, so as to maximize the coverage of the heat concentration area of the gas generator 40 when it explodes, and to achieve high-efficiency heat dissipation. The included angle between the spiral line of the spiral body and the axis of the cylinder 10 is 15°-35°. As a specific example, in the embodiment, the total height of the spiral body accounts for 65% of the total height of the cylinder 10, and the included angle between the spiral line of the spiral body and the axis of the cylinder 10 is 20°.

[0034] In the axial direction of the cylinder 10, the winding density of the spiral body can be designed in the following two schemes: the first is that the winding density of the spiral body remains consistent in the axial direction of the cylinder 10, which is suitable for the case that the heat generated by the gas generator 40 when it explodes is uniformly distributed along the axial direction of the cylinder 10. Through equidistant winding, the heat absorbed by the cooling liquid in unit length can be balanced, so as to maintain the stability of the overall temperature in the containing cavity and improve the consistency of the test data. The second is that the winding density of the spiral body gradually decreases from the bottom of the cylinder 10 to the top of the cylinder 10, which can also be understood as that the winding density of the spiral body in the lower region of the cylinder 10 is greater than that in the top region of the cylinder 10. This design is based on the fact that in many actual working conditions, the heat generated at the bottom of the cylinder 10 during the explosion of the gas generator 40 is more concentrated. By increasing the winding density of the cooling pipeline 51 at the bottom of the cylinder 10, the heat dissipation effect of the cooling pipeline 51 on the bottom region of the cylinder 10 can be targetedly improved, the temperature gradient can be effectively controlled, and the accuracy of the test results can be improved.

[0035] Further, the liquid inlet end 511 of the cooling pipeline 51 is arranged adjacent to the top port of the cylinder 10, the liquid outlet end 512 of the cooling pipeline 51 is arranged adjacent to the bottom edge of the cylinder 10, and the liquid inlet end 511 and the liquid outlet end 512 are respectively arranged on two opposite sides of the cylinder 10. This layout can form a convection circulation of the cooling liquid. The low-temperature cooling liquid entering from the liquid inlet end 511 at the top of the cylinder 10 can fully absorb the heat generated after the explosion of the gas generator 40 under the action of gravity and convection during the downward flow along the spiral cooling pipeline 51, and then flow out from the bottom, effectively improving the cooling efficiency.

[0036] Further, the connecting head 52 is provided with a plurality of clamping protrusions 521 on the circumferential outer wall, which can be tightly engaged with the inner wall of the pipe opening of the external pipeline, effectively preventing loosening of the connection between the external pipeline and the connecting head 52. In the embodiment, the outer diameter of the connecting head 52 gradually decreases outward along the axial direction of the connecting head 52 from the end connected with the cooling pipeline 51, which facilitates the sleeving of the external pipeline on the connecting head 52, and the sleeving of the external pipeline on the connecting head 52 can be guided during the installation process, so that the external pipeline is firmly sleeved on the connecting head 52, and the sealing performance of the connection is ensured.

[0037] In actual use, the use method of the pressure container can be as follows: first, the gas generator 40 to be tested is stably installed in the cylinder body 10 through the mounting bracket 11, and the gas outlet of the gas generator 40 is ensured to face the top port of the cylinder body 10. The pressure sensors are correspondingly connected in the plurality of pressure sensor interfaces 61 on the side wall of the cylinder body 10, and the temperature sensor is connected in the temperature sensor interface 62. The temperature sensor is connected to the data acquisition system to display the temperature curve in real time, and the pressure sensor is connected to the data acquisition system, and the predetermined parameters are set to collect test data. Then, the overall cylinder body 10 is firmly fixed on the T-shaped base platform to avoid shaking of the cylinder body 10 during the test to affect the accuracy of the data. The flexible air bag 30 made of specific size is uniformly covered on the inner surface of the cylinder body 10 to simulate the real air bag environment. Then, the explosion-proof cover 20 is arranged on the top of the cylinder body 10, and the plurality of clamping hooks on the cylinder body 10 are correspondingly clamped with the plurality of clamping blocks on the explosion-proof cover 20 to firmly fix the flexible air bag 30 in the cylinder body 10.

[0038] At this time, the cooling circulation system is opened to make the cooling liquid circulate in the cooling pipeline 51, and the circulation flow rate in the cooling pipeline 51 is accurately adjusted according to the temperature shown by the temperature curve to maintain the temperature in the containing cavity in the required temperature range. At the same time, the air exhaust valve interface 64 on the side wall of the cylinder body 10 is connected with the external exhaust system, and the electromagnetic valve of the exhaust passage is ensured to be in the closed state before the test. Finally, the air bag point explosion wire bundle interface 63 on the side wall of the cylinder body 10 is connected with the point explosion wire of the gas generator 40 and connected to the point explosion device, and the resistance of the gas generator 40 is carefully detected before the test to ensure that it is in the normal range.

[0039] After preparation, the test process is started, specifically, the on-site personnel are evacuated, the test parameters are comprehensively checked in the master control system, after confirmation of no error, the test start switch is pressed, the gas generator 40 is detonated, the data acquisition system is synchronously triggered, the active exhaust system is triggered according to the preset time delay, until the test is completed.After the test is completed, the test data is downloaded, the exhaust switch is opened, after the gas is exhausted, the rigid explosion-proof cover 20 is opened, the gas generator 40 is taken out, and thus the whole test process is completed.

[0040] In conclusion, the pressure vessel has the advantages that: the flexible air bag is arranged in the cylinder body to simulate the dynamic change of the air bag volume and the internal pressure in the actual safety air bag working process, the collected pressure curve is closer to the actual situation, and the accuracy of the test result is greatly improved; the cooling pipeline is arranged in the cylinder body, the cooling pipeline is spirally wound along the circumferential inner wall of the cylinder body, when the heat of the gas generator is gathered, the cooling liquid in the cooling pipeline carries away the heat through circulation, the temperature in the containing cavity is effectively reduced, the test environment temperature is stable, the test data deviation caused by temperature fluctuation is reduced, and the consistency and reliability of the test data are improved.

[0041] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the application scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application application should be subject to the appended claims.

Claims

1. A pressure vessel for use in performance testing of a gas generator, characterized in that, The pressure container comprises a cylinder, an explosion-proof cover matched with the cylinder, and a flexible air bag arranged in the cylinder, a circumferential edge of the flexible air bag being fixed between the cylinder and the explosion-proof cover, a cooling pipeline being arranged in the cylinder, the cooling pipeline being spirally wound along the circumferential inner wall of the cylinder to form a spiral body, a total height of the spiral body accounting for 60%-80% of a total height of the cylinder, and an included angle between a spiral line of the spiral body and an axis of the cylinder being 15°-35°.

2. The pressure vessel of claim 1, wherein, In the axial direction of the cylinder, the winding density of the spiral body is consistent.

3. The pressure vessel of claim 1, wherein, In the axial direction of the cylinder, the winding density of the spiral body gradually decreases from the bottom of the cylinder to the top of the cylinder.

4. The pressure vessel of claim 1, wherein, The liquid inlet end of the cooling pipeline is arranged adjacent to the top port of the cylinder, the liquid outlet end of the cooling pipeline is arranged adjacent to the bottom edge of the cylinder, and the liquid inlet end and the liquid outlet end are respectively arranged at two opposite sides of the cylinder.

5. The pressure vessel of claim 4, wherein, The liquid inlet end and the liquid outlet end of the cooling pipeline are respectively provided with a connecting head for connecting the cooling pipeline with an external pipeline, a plurality of clamping protrusions are arranged on the circumferential outer wall of the connecting head in a spaced manner, and the outer diameter of the connecting head gradually decreases outward along the axial direction of the connecting head from one end of the connecting head connected with the cooling pipeline.

6. The pressure vessel of claim 1, wherein, An installation support is arranged on the inner bottom wall of the cylinder, the installation support being used for installing a gas generator, and an air outlet hole of the gas generator is arranged towards the top port of the cylinder.

7. The pressure vessel of claim 1, wherein, At least two pressure sensor interfaces are arranged on the side wall of the cylinder, and the pressure sensor interfaces are arranged in a spaced manner along the axial direction of the cylinder.

8. The pressure vessel of claim 7, wherein, A temperature sensor interface, an air bag point explosion wire harness interface and an exhaust valve interface are further arranged on the side wall of the cylinder.

9. The pressure vessel of claim 1, wherein, A plurality of first exhaust holes are arranged on the top of the explosion-proof cover, and a plurality of second exhaust holes are arranged on the circumferential side wall of the explosion-proof cover.

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