An apparatus for generating internal explosion quasi-static pressure

Abstract

An internal explosion quasi-static pressure generating device disclosed by the present invention relates to an internal explosion quasi-static pressure generating device for anti-explosion performance testing of ship bulkheads and hatch structures, and belongs to the field of structural anti-explosion performance evaluation and testing. The present invention mainly consists of an inflation chamber diaphragm, an inflation chamber, a test piece, a pressure relief chamber, a diaphragm holder, a connecting pipe, a pressure relief chamber diaphragm, a fixed base, and an inflation pipe. Since the connecting pipe connects the pressure relief chamber and the inflation chamber, the pressures in the pressure relief chamber and the inflation chamber rise synchronously, no pressure difference will be formed on both sides of the test piece, and uniform quasi-static pressure can be generated, eliminating the influence of the explosive-driven shock wave on the structure to be evaluated, and the peak value of the generated quasi-static pressure is controllable. By controlling the number of ruptured pressure relief chamber diaphragms and the size of the pressure relief ports in the pressure relief chamber, the pressure relief time of the pressure relief chamber can be controlled to adapt to various working conditions for evaluation. Since the structure is subjected to static loads during inflation, the strength requirement for the structure is low, and the purpose of multiple repeated use can be achieved.

Description

Technical Field

[0001] The present invention relates to a device for generating quasi-static pressure of internal explosion, and particularly to a device for generating quasi-static pressure of internal explosion for testing the anti-explosion performance of ship bulkheads and hatch structures, belonging to the field of structural anti-explosion performance evaluation and testing. Background Art

[0002] Nowadays, anti-ship missiles, with their typical characteristics of high flight speed, large explosive yield, and high hitting accuracy, pose an increasingly serious threat to surface ships. Most of the existing anti-ship missiles are semi-armor-piercing anti-ship missiles. When they hit a ship, they will first penetrate into the ship's interior with the help of a delay fuse and explode in the cabin. The damage elements generated mainly include shock waves, fragments, and quasi-static pressure. The shock wave is characterized by a high peak value, a short duration, a small cumulative impulse, and a small damage range to the ship, mainly damaging the explosion compartment. Although the quasi-static pressure formed after the shock wave has a low peak value, it has a long duration, acts on the entire bulkhead, and has a large cumulative impulse, which will cause the bulkhead structure to tear at the boundary, resulting in the collapse of the entire bulkhead. This causes extensive damage to the ship, leading to the ingress of water into multiple watertight compartments and ultimately causing the ship to lose its vitality and thus the initiative in a naval war.

[0003] From the above analysis, it can be seen that the main culprit for the extensive damage to the cabin caused by anti-ship missiles is the internal explosion quasi-static pressure. Therefore, the performance of the bulkhead structure against internal explosion quasi-static pressure is crucial and a performance that must be evaluated during the ship design stage. The "Lloyd's Rules" of the British Maritime Technology Committee clearly stipulate the assessment method for the anti-quasi-static pressure performance of bulkhead structures. However, relevant domestic assessment devices are currently relatively lacking. Based on this analysis, it is necessary to design a quasi-static pressure assessment device.

[0004] The conventional method of using explosive internal explosion to generate quasi-static pressure is the most realistic method. However, the generated pressure includes shock waves and quasi-static pressure. Although relevant methods can be used to absorb the energy of shock waves, it is impossible to completely eliminate the influence of shock waves. The influence of shock waves mixed in will affect the assessment of quasi-static pressure. Finally, if it is damaged, it is difficult to distinguish whether it is caused by shock waves or quasi-static pressure. Therefore, it is necessary to seek a solution that only generates quasi-static pressure to equivalent the internal explosion quasi-static pressure. The typical quasi-static pressure of internal explosion in a locally confined space is a curve that first rises to the maximum and then drops. Summary of the Invention

[0005] The main object of the present invention is to provide a device for generating quasi-static pressure by internal explosion, which can eliminate the influence of shock waves driven by explosives, generate a plane wave with a uniform pressure distribution, and the peak value of the generated quasi-static pressure is controllable, so as to accurately test and evaluate the anti-explosion performance of the implosion structure. The present invention has the advantages of high test and evaluation accuracy, simple structure, being reusable, and adapting to various working conditions. The present invention is particularly suitable for evaluating the ability of a ship's cabin to resist quasi-static pressure, and can also be used to evaluate the performance of other similar grillage structures and materials in resisting internal explosion quasi-static pressure. The ship's cabin includes bulkheads and hatches.

[0006] The object of the present invention is achieved by the following technical solutions:

[0007] A device for generating quasi-static pressure by internal explosion disclosed by the present invention mainly consists of an air chamber diaphragm, an air chamber, a test piece, a pressure relief chamber, a diaphragm holder, a connecting pipe, a pressure relief chamber diaphragm, a fixed base, and an air filling pipe.

[0008] The assembly method of the test piece is clamped by the air chamber and the pressure relief chamber. The air chamber and the pressure relief chamber are assembled by bolt connection, and a sealing structure is provided on the connection surface. The air chamber and the pressure relief chamber are connected by welding of rectangular plates, and their structural strength is strengthened by external reinforcing ribs. The internal corners of the air chamber and the pressure relief chamber are transitioned by arcs to eliminate stress concentration. The air chamber is provided with a pressure relief port and is equipped with an air chamber diaphragm. The air chamber is provided with an air filling pipe connected to an air compressor. The air chamber and the pressure relief chamber are connected by a connecting pipe, and the pressures on both sides of the test piece are ensured to rise synchronously through the connecting pipe during air filling. The pressure relief chamber and the diaphragm holder are bolt-connected, and a sealing structure is provided on the connection surface. The diaphragm holder is provided with a diaphragm interface for installing the pressure relief chamber diaphragm. The pressure relief chamber diaphragm is bolt-connected to the diaphragm holder, and a sealing structure is provided on the connection surface. Pressure gauges are installed on both the air chamber and the pressure relief chamber.

[0009] Further, when the pressure rises to the assessment pressure, the diaphragm is ruptured by manual membrane rupture. The manual membrane rupture method is cutting cord membrane rupture. Since there is more than one diaphragm, the synchronous network initiation method is used for membrane rupture during membrane rupture, and the combined force ensures that the quasi-static pressure meets the experimental evaluation requirements.

[0010] Further, when the pressure relief chamber diaphragm ruptures, the pressure relief time is controlled by controlling the number of ruptured membranes and the size of the pressure relief port, thereby controlling the rising time of the quasi-static pressure.

[0011] Further, when the air chamber diaphragm ruptures, the pressure relief time is controlled by controlling the number of ruptured membranes and the size of the pressure relief port, thereby controlling the falling time of the quasi-static pressure.

[0012] Further, the air chamber and the pressure relief chamber are connected by welding of rectangular steel plates.

[0013] Furthermore, the fixed base is connected to the inflatable chamber by welding.

[0014] Furthermore, the fixed base is connected to the ground concrete foundation by bolts. The fixed base is used to restrict the degrees of freedom of the entire test device during the test.

[0015] Furthermore, the inflatable chamber is provided with 3 pressure relief ports and 3 inflatable chamber diaphragms are installed. There are 4 diaphragm interfaces on the diaphragm rack for installing the pressure relief chamber diaphragms.

[0016] The working method of a device for generating internal explosion quasi-static pressure disclosed by the present invention is as follows: The test piece is assembled into the inflatable chamber, and then the pressure relief chamber is assembled with the inflatable chamber. The pressure relief chamber and the inflatable chamber clamp the test piece. The pressure relief chamber diaphragms are pre-installed on the diaphragm rack. After the installation of the pressure relief chamber is completed, the diaphragm rack is assembled with the pressure relief chamber. When all components are assembled, the inflatable chamber is inflated through an air compressor connected to an air inlet pipe. Pressure gauges are installed on the side walls of the inflatable chamber and the pressure relief chamber to continuously monitor and record the pressure inside the test device. Since the communicating pipe connects the pressure relief chamber and the inflatable chamber, the pressures in the pressure relief chamber and the inflatable chamber rise synchronously, and no pressure difference will be formed on both sides of the test piece, resulting in the generation of prestress. When the pressure inside the device rises to the test pressure, the valve on the communicating pipe is closed. The purpose of closing the valve is to prevent the pressure in the inflatable chamber from being released simultaneously when the pressure relief chamber is depressurized. After closing the valve, the cutting cable is detonated to break the diaphragm of the pressure relief chamber, so that the pressure in the pressure relief chamber is released. When the pressure relief is complete, the diaphragm of the inflatable chamber is broken through the delayed detonation function, so that the pressure in the pressure relief chamber is released, so that the pressure difference formed on both sides of the test piece is the same as the form of the real internal explosion quasi-static pressure load, and it is convenient for the next experiment.

[0017] Beneficial effects:

[0018] 1. When designing a ship, it is necessary to consider the performance of the bulkhead against quasi-static pressure, and it is necessary to test the performance of the bulkhead structure against quasi-static pressure. Internal explosion is a conventional method for generating quasi-static pressure. Since internal explosion will generate the interference of shock waves and there is no good way to absorb shock waves, the explosive driving scheme cannot generate a single quasi-static pressure, the test pressure is not clear, and the test result of the quasi-static pressure is inaccurate. A device for generating internal explosion quasi-static pressure disclosed by the present invention, since the communicating pipe connects the pressure relief chamber and the inflatable chamber, the pressures in the pressure relief chamber and the inflatable chamber rise synchronously, and no pressure difference will be formed on both sides of the test piece, resulting in the generation of prestress, can generate a uniform quasi-static pressure, eliminate the influence of the explosive-driven shock wave on the test structure, and the peak value of the generated quasi-static pressure is controllable and the same as the maximum pressure of inflation.

[0019] 2. A device for generating quasi-static pressure by internal explosion disclosed by the present invention can control the pressure relief time of the pressure relief chamber, that is, the rising time of the quasi-static pressure, by controlling the number of ruptured diaphragms in the pressure relief chamber and the size of the pressure relief ports in the pressure relief chamber, so as to evaluate the response of the structure under different loading rates. It can also control the pressure relief time of the gas charging chamber, that is, the falling time of the quasi-static pressure, by controlling the number of ruptured diaphragms in the gas charging chamber and the size of the pressure relief ports in the gas charging chamber. Thus, it can evaluate the response of the structure under various working conditions and meet the requirements for evaluating the anti-explosion performance of the bulkhead under various working conditions.

[0020] 3. A device for generating quasi-static pressure by internal explosion disclosed by the present invention is subject to static loads during gas charging, with low requirements for the strength of the structure, and can achieve the purpose of repeated use.

[0021] 4. When the pressure in the device for generating quasi-static pressure by internal explosion disclosed by the present invention rises to the test pressure, the valve on the connecting pipe is closed. The purpose of closing the valve is to prevent the pressure in the gas charging chamber from being released simultaneously when the pressure relief chamber is depressurized, thereby improving the accuracy of experimental evaluation.

[0022] 5. When the pressure rises to the test pressure in the device for generating quasi-static pressure by internal explosion disclosed by the present invention, the diaphragm is ruptured by artificial membrane rupture. The artificial membrane rupture method is cutting cord membrane rupture. Since there is more than one diaphragm, the synchronous network initiation method is used for membrane rupture during membrane rupture, and the combined force ensures that the quasi-static pressure meets the requirements of experimental evaluation.

[0023] 6. On the basis of achieving the above beneficial effects, the device for generating quasi-static pressure by internal explosion disclosed by the present invention can eliminate the influence of the shock wave driven by explosives, generate a plane wave with uniform pressure distribution, and the peak value of the generated quasi-static pressure is controllable, enabling accurate testing and evaluation of the anti-explosion performance of the internal explosion structure. The present invention has the advantages of high testing and evaluation accuracy, simple structure, being able to be reused, and adapting to various working conditions. The present invention is particularly suitable for evaluating the ability of a ship's hull to resist quasi-static pressure, and can also be used to evaluate the anti-internal explosion quasi-static pressure performance of other similar plate frame structures and materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 An isometric view of the device for generating quasi-static pressure by internal explosion disclosed by the present invention.

[0025] Figure 2 A front view of the device for generating quasi-static pressure by internal explosion disclosed by the present invention.

[0026] Figure 3 A rear view of the device for generating quasi-static pressure by internal explosion disclosed by the present invention.

[0027] Figure 4 Top view of a device for generating quasi-static pressure by internal explosion disclosed by the present invention.

[0028] Figure 5 Right view of a device for generating quasi-static pressure by internal explosion disclosed by the present invention.

[0029] Wherein: 1 - Inflatable chamber diaphragm, 2 - Inflatable chamber, 3 - Test piece, 4 - Pressure relief chamber, 5 - Diaphragm holder, 6 - Connecting pipe, 7 - Pressure relief chamber diaphragm, 8 - Fixed base, 9 - Inflating pipe. Specific embodiments

[0030] To better illustrate the purpose and advantages of the present invention, the following further describes the content of the invention in conjunction with the drawings and examples.

[0031] Example 1:

[0032] As Figures 1 to 5 shown, a device for generating quasi-static pressure by internal explosion disclosed in this embodiment is composed of an inflatable chamber diaphragm 1, an inflatable chamber 2, a test piece 3, a pressure relief chamber 4, a diaphragm holder 5, a connecting pipe 6, a pressure relief chamber diaphragm 7, a fixed base 8, and an inflating pipe 9. The inflatable chamber diaphragm 1 is installed on the pressure relief port of the inflatable chamber 2. The test chamber wall 3 is clamped by the inflatable chamber 2 and the pressure relief chamber 4. The connecting pipe 6 connects the inflatable chamber 2 and the pressure relief chamber 4. The diaphragm holder 5 is used to install the pressure relief chamber diaphragm 7. The fixed base 8 is welded to the inflatable chamber 2, and the fixed base 8 is bolted to the ground concrete foundation.

[0033] A device for testing the anti-explosion performance of a chamber wall by driving an equivalent internal explosion quasi-static pressure with high-pressure gas. Its overall material is made of pressure vessel steel. As Figure 1 shown in the axonometric drawing, the overall placement method of the device is horizontal. The inflatable chamber 2 is fixed on the ground concrete fixed base 8. The entire assembly process is as follows: first, the test piece is assembled into the inflatable chamber, then the pressure relief chamber is assembled with the inflatable chamber, and the pressure relief chamber 4 and the inflatable chamber 2 clamp the test piece 3, as Figure 5 shown in the cross-sectional view. The pressure relief chamber diaphragm 7 is pre-installed on the diaphragm holder 5. After the pressure relief chamber 4 is installed, the diaphragm holder 5 is assembled with the pressure relief chamber 4. When all components are assembled, start inflating the inflatable chamber 2 through the air compressor connected to the inflating pipe 9. Pressure gauges are installed on the side walls of the inflatable chamber 2 and the pressure relief chamber 4 to record the pressure inside the test device at all times. Since there is a connecting pipe 6 connecting the pressure relief chamber 4 and the inflatable chamber 2, as Figure 5As shown, the pressures in the pressure relief chamber 4 and the inflation chamber 2 can rise synchronously, without forming a pressure difference on both sides of the test piece 3, which may cause the generation of prestress. When the pressure in the device rises to the assessment pressure, the valve on the connecting pipe 6 is closed. The purpose of closing the valve is to prevent the pressure in the inflation chamber 2 from being released simultaneously when the pressure relief chamber 4 is depressurized. After closing the valve, the cutting cable is detonated to rupture the diaphragm 7 of the pressure relief chamber, so that the pressure in the pressure relief chamber 4 is released. When the pressure relief is complete, the diaphragm 7 of the inflation chamber is ruptured through the delayed detonation function, so that the pressure in the pressure relief chamber 4 is released. The pressure difference formed on both sides of the test piece 3 is the same as the form of the real quasi-static pressure load during internal explosion, and it is convenient for the next experiment.

[0034] The above specific description further details the purpose, technical solution and beneficial effects of the invention. It should be understood that the above is only a specific embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An internal explosion quasi-static pressure generating device, characterized in that: It mainly consists of an inflation chamber diaphragm, an inflation chamber, a test piece, a pressure relief chamber, a diaphragm holder, a connecting pipe, a pressure relief chamber diaphragm, a fixed base, and an inflation pipe; The assembly method of the test piece is clamped by the inflation chamber and the pressure relief chamber; the inflation chamber and the pressure relief chamber are assembled by bolt connection, and a sealing structure is provided on the connection surface; the inflation chamber and the pressure relief chamber are connected by welding of rectangular plates, and their structural strength is strengthened by ribs on the outside; the internal corners of the inflation chamber and the pressure relief chamber are transitioned by arcs to eliminate stress concentration; the inflation chamber is provided with a pressure relief port and is equipped with an inflation chamber diaphragm; the inflation chamber is provided with an inflation pipe connected to an air compressor; the inflation chamber and the pressure relief chamber are connected by a connecting pipe, and the pressures on both sides of the test piece are ensured to rise synchronously through the connecting pipe during inflation; the pressure relief chamber and the diaphragm holder are bolt-connected, and a sealing structure is provided on the connection surface; the diaphragm holder is provided with a diaphragm interface for installing the pressure relief chamber diaphragm; the pressure relief chamber diaphragm is bolt-connected to the diaphragm holder, and a sealing structure is provided on the connection surface; pressure gauges are installed on both the inflation chamber and the pressure relief chamber.

2. The internal explosion quasi-static pressure generating device according to claim 1, characterized in that: When the pressure rises to the assessment pressure, the diaphragm is ruptured by manual membrane rupture; the manual membrane rupture method is cutting cable membrane rupture. Since there is more than one diaphragm, the synchronous network initiation method is used for membrane rupture during membrane rupture, and the combined force ensures that the quasi-static pressure meets the experimental evaluation requirements.

3. The internal explosion quasi-static pressure generating device according to claim 1, characterized in that: When the pressure relief chamber diaphragm ruptures, the pressure relief time is controlled by controlling the number of ruptured membranes and the size of the pressure relief port, thereby controlling the rise time of the quasi-static pressure.

4. The internal explosion quasi-static pressure generating device according to claim 1, characterized in that: When the inflation chamber diaphragm ruptures, the pressure relief time is controlled by controlling the number of ruptured membranes and the size of the pressure relief port, thereby controlling the fall time of the quasi-static pressure.

5. The internal explosion quasi-static pressure generating device according to claim 1, characterized in that: The inflation chamber and the pressure relief chamber are connected by welding of rectangular steel plates.

6. The internal explosion quasi-static pressure generating device according to claim 1, characterized in that: The fixed base is connected to the inflation chamber by welding.

7. The internal explosion quasi-static pressure generating device according to claim 1, characterized in that: The fixed base is connected to the ground concrete foundation by bolts; the fixed base is used to limit the degrees of freedom of the entire assessment device during the assessment test.

8. The internal explosion quasi-static pressure generating device according to claim 1, characterized in that: The inflation chamber is provided with 3 pressure relief ports and is equipped with 3 inflation chamber diaphragms; the diaphragm holder is provided with 4 diaphragm interfaces for installing the pressure relief chamber diaphragms.

9. A device for generating internal explosion quasi-static pressure according to any one of claims 1 to 8, characterized in that: The test piece is assembled into the inflation chamber, and then the pressure relief chamber is assembled with the inflation chamber. The test piece is clamped between the pressure relief chamber and the inflation chamber. The diaphragm of the pressure relief chamber is pre-installed on the diaphragm holder. After the installation of the pressure relief chamber is completed, the diaphragm holder is assembled with the pressure relief chamber. When all components are assembled, the inflation chamber is inflated through an air compressor connected to the inflation pipe. Pressure gauges are installed on the side walls of the inflation chamber and the pressure relief chamber to continuously monitor and record the pressure inside the test device. Since the connecting pipe connects the pressure relief chamber and the inflation chamber, the pressures in the pressure relief chamber and the inflation chamber rise synchronously, and no pressure difference is formed on both sides of the test piece, resulting in the generation of prestress. When the pressure inside the device rises to the test pressure, the valve on the connecting pipe is closed. The purpose of closing the valve is to prevent the pressure in the inflation chamber from being released simultaneously when the pressure relief chamber is depressurized. After closing the valve, the cutting cable is detonated to rupture the diaphragm of the pressure relief chamber, causing the pressure in the pressure relief chamber to be released. When the pressure relief is complete, the diaphragm of the inflation chamber is ruptured through the delayed detonation function, causing the pressure in the pressure relief chamber to be released, so that the pressure difference formed on both sides of the test piece is the same as the form of the true implosion quasi-static pressure load, and it is convenient for the next experiment.

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