Variable cross-section shock tube testing device capable of being regulated during positive pressing

Abstract

The utility model provides a variable cross-section shock tube testing device capable of being regulated and controlled during positive pressing. The variable cross-section shock tube testing device comprises an air compressor; the high-pressure driving section, the transition section, the expansion section and the pressure relief section are connected in sequence; the high-pressure driving section is connected with an air compressor through a pipeline; a diaphragm is arranged at the joint of the transition section and the high-pressure driving section, and the output end of the diaphragm is sequentially communicated with the expansion section and the pressure relief section; the output end of the pressure relief section is connected with a to-be-tested structural member; the small end of the expansion section is connected with the transition section through a flange, and the large end is connected with the pressure relief section; and a diaphragm clamping mechanism is arranged between the high-pressure driving section and the transition section. The large-scale variable cross-section shock tube provided by the utility model is more economical and safer, can be used for carrying out a structural member full-scale test, and can be used for regulating and controlling the positive pressure holding of an explosive wave.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosion wave simulation test devices, and particularly relates to a variable cross-section shock tube test device with adjustable positive pressure holding time. Background Art

[0002] A shock tube can simulate an exponential decay waveform similar to the air explosion shock wave, and is an ideal platform for carrying out explosion damage effect research in the laboratory. It is often used in explosion damage experimental research in fields such as weaponry, building structures, and biomedicine.

[0003] Research status in the prior art: 1. There is an anti-explosion shock tube with a diameter of Φ1485mm and a total tube length of 42 meters. Its driving section uses explosives as the high-pressure energy source, with an inner diameter of 348mm and an inner diameter of 1485mm in the test section; 2. There is a shock tube with a constant diameter, which uses a compressed air driving method. The high-pressure section is 0.128m long, the low-pressure section is 2m long, the outer diameter is 0.09m, the inner diameter is 0.066m, and the diaphragm device is 0.03m long.

[0004] Defects in the prior art: 1. The large shock tube test device is too long, has high requirements for the site, and generally uses detonation driving. Whether it is explosive detonation or combustible mixture detonation, there are problems such as high economic costs, poor repeatability, and high danger; 2. The shock tube driven by compressed air usually has a constant diameter form, and the diameter of the end port is too small, generally between 0.1m and 0.5m, and is only suitable for carrying out material scale tests and cannot meet the needs of carrying out full-scale tests; 3. Neither can effectively regulate the positive pressure holding time of the explosion wave. However, when conducting anti-explosion performance tests, the duration must reach or exceed the minimum duration specified in the explosion safety assessment report. Summary of the Invention

[0005] The purpose of the utility model is to provide a variable cross-section shock tube test device with adjustable positive pressure holding time, so as to solve the deficiencies existing in the actual application of the existing shock tube test device, and provide a large variable cross-section shock tube that is more economical, safer, can carry out full-scale tests of structural components, and can regulate the positive pressure holding time of the explosion wave. The technical solution adopted is as follows:

[0006] A variable cross-section shock tube test device with adjustable positive pressure holding time, comprising:

[0007] An air compressor 1;

[0008] And a high-pressure driving section 2, a transition section 3, an expansion section 4 and a pressure relief section 5, which are connected in sequence. The high-pressure driving section 2 is connected to the air compressor 1 through a pipeline;

[0009] A diaphragm 33 is arranged at the connection between the transition section 3 and the high-pressure driving section 2;

[0010] The said extension section 4, its small end is connected to the transition section 3 through a flange, and its large end is connected to the pressure relief section 5;

[0011] The output end of the pressure relief section 5 is connected to a structural member; a diaphragm clamping mechanism is arranged between the high-pressure driving section 2 and the transition section 3.

[0012] Preferably, the high-pressure driving section 2 includes a closed-end fixing seat 21, a high-pressure driving section body, and an open-end fixing seat 22 that are connected in sequence;

[0013] The said closed-end fixing seat 21 is provided with an air injection hole 211 thereon, one end thereof facing the air compressor 1 is closed, and it is connected to the high-pressure driving section body through the air injection hole 211. The air compressor 1 injects driving gas into the high-pressure driving section 2 through the air injection hole 211;

[0014] The said open-end fixing seat 22 is of an annular structure, and its inner ring is fixed to the high-pressure driving section body;

[0015] The said open-end fixing seat 22 is provided with a first through-hole 221 that penetrates the open-end fixing seat 22 axially; the first through-hole 221 allows the movable end of the diaphragm clamping mechanism to pass through;

[0016] The said transition section 3 includes a first fixing seat 31 forming its input end, a second fixing seat 32 forming its output end, and the second fixing seat 32 forming its output end is connected to the flange of the extension section 4;

[0017] The said first fixing seat 31 forming the input end of the transition section is aligned with the open-end fixing seat 22, and is provided with a second through-hole 311 that penetrates the first fixing seat 31. The second through-hole 311 allows the movable end of the diaphragm clamping mechanism to pass through; the second through-hole 311 is arranged corresponding to the first through-hole 221;

[0018] The said diaphragm clamping mechanism has its main body arranged in the transition section 3, and its movable end passes through the second through-hole 311 and the first through-hole 221 in sequence to clamp the high-pressure driving section 2 and the transition section 3.

[0019] Preferably, the clamping mechanism is a hydraulic jack, and its piston forms its movable end.

[0020] Preferably, the cross-section of the large end of the extension section 4 is a square cross-section, and its cross-sectional size is not less than 3m×3m.

[0021] Preferably, the length range of the high-pressure driving section 2 is 2m - 5m.

[0022] Preferably, the pressure relief section 5 is of a rigid frame structure, and a number of pressure relief holes 51 are opened on its outer wall.

[0023] Preferably, a pressure sensor 52 is provided at the center of the top surface of the pressure relief section 5.

[0024] Preferably, the pressure relief section 5 and the expansion section 4 are connected by bolts.

[0025] Preferably, the expansion section 4 is made of steel material, and stiffening ribs are provided on its outer surface.

[0026] Preferably, the high-pressure drive section 2, the transition section 3, and the expansion section 4 are all supported by supports; the high-pressure drive section 2 and the transition section 3 are both made of steel material.

[0027] Compared with the prior art, the advantages of the present utility model are as follows:

[0028] 1. The variable cross-section shock tube device of the present utility model is provided with a high-pressure drive section, a transition section, an expansion section, and a pressure relief section. It adopts a compressed air drive mode, which has less damage to the shock tube, lower economic cost, and is safe and controllable, and is suitable for ordinary scientific research units;

[0029] 2. The variable cross-section shock tube device of the present utility model has a terminal cross-sectional size of not less than 3m×3m, and can carry out various types of full-scale tests.

[0030] 3. The variable cross-section shock tube device of the present utility model has an adjustable high-pressure drive section length in the range of 2m - 5m. As Figure 8 shown, different positive-pressure duration air-blast shock waves can be simulated by changing the length of the high-pressure drive section according to the test requirements.

[0031] 4. The air-blast shock waves with different reflected overpressure peaks can be simulated by controlling the diaphragm rupture pressure. "Reflected overpressure" refers to the overpressure after the shock wave is reflected when it encounters an obstacle during operation; "reflected overpressure peak" refers to the maximum value of the reflected overpressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a side view of a variable cross-section shock tube test device with adjustable positive-pressure duration;

[0033] Figure 2 is Figure 1 exploded schematic diagram of;

[0034] Figure 3 is a structural schematic diagram of the high-pressure drive section;

[0035] Figure 4 is a structural schematic diagram of the transition section;

[0036] Figure 5 is a structural schematic diagram of the expansion section;

[0037] Figure 6 is a structural schematic diagram of the pressure relief section;

[0038] Figure 7 It is a schematic diagram of the state of a hydraulic jack;

[0039] Figure 8 It is a test schematic diagram between the length of the high-pressure driving section and the positive pressure holding time.

[0040] Among them, 1 - air compressor;

[0041] 2 - high-pressure driving section, 21 - closed-end fixing seat, 211 - air injection hole, 22 - open-end fixing seat, 221 - first opening;

[0042] 3 - transition section, 31 - first fixing seat, 311 - second opening, 32 - second fixing seat, 33 - diaphragm;

[0043] 4 - expansion section, 5 - pressure relief section, 51 - pressure relief hole, 52 - overpressure sensor. Specific implementation manners

[0044] The following will describe in more detail the test device of a variable cross-section shock tube with adjustable positive pressure holding time of the present utility model in conjunction with the schematic diagram, in which the preferred embodiments of the present utility model are shown. It should be understood that those skilled in the art can modify the present utility model described herein while still achieving the beneficial effects of the present utility model. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present utility model.

[0045] As Figures 1 to 8 , a test device of a variable cross-section shock tube with adjustable positive pressure holding time includes: an air compressor 1, a high-pressure driving section 2, a transition section 3, an expansion section 4 and a pressure relief section 5.

[0046] The air compressor 1 provides high-pressure driving gas for the shock tube experiment device for testing.

[0047] The high-pressure driving section 2, the transition section 3, the expansion section 4 and the pressure relief section 5 are connected in sequence, and the high-pressure driving section 2 is connected to the air compressor 1 through a pipeline. Among them, the high-pressure driving section 2, the transition section 3 and the expansion section 4 are all provided with supports for support; the high-pressure driving section 2, the transition section 3 and the expansion section 4 are all made of steel materials.

[0048] Among them, the ambient pressure is 0.1 MPa, and a pressure greater than the ambient pressure is a high pressure. The maximum pressure that the high-pressure driving section 2 can maintain normal and safe operation is 10 MPa.

[0049] A diaphragm 33 is provided at the connection between the transition section 3 and the high-pressure driving section 2. After the diaphragm 33 ruptures, the high-pressure driving section 2, the transition section 3, the expansion section 4 and the pressure relief section 5 are connected in sequence.

[0050] Among them, the diaphragm 33 is an aluminum film and is fixed to the first fixing seat 31 of the transition section 3. Before the diaphragm 33 ruptures, it closes the gas passage in the transition section 3.

[0051] As Figure 4 shown, the gas passage in the transition section 3 penetrates through the transition section body and the second fixing seat 32 of the transition section 3.

[0052] The expansion section 4, its small end is connected to the transition section 3 through a flange, and its large end is connected to the pressure relief section 5;

[0053] The output end of the pressure relief section 5 is connected to the structural member;

[0054] A diaphragm clamping mechanism is arranged between the high-pressure drive section 2 and the transition section 3.

[0055] As Figure 3 shown, the high-pressure drive section 2 includes a closed-end fixing seat 21, a high-pressure drive section body, and an open-end fixing seat 22 that are connected in sequence;

[0056] The closed-end fixing seat 21 is provided with an air injection hole 211 on it, and one end of it facing the air compressor 1 is closed. The air compressor 1 injects driving gas into the high-pressure drive section 2 through the air injection hole 211.

[0057] The open-end fixing seat 22 is a circular ring structure, and its inner ring is fixed to the high-pressure drive section body.

[0058] The open-end fixing seat 22 forms the output end of the high-pressure drive section 2, and a first opening 221 that penetrates the open-end fixing seat 22 axially is provided on it; the first opening 221 allows the movable end of the diaphragm clamping mechanism to pass through.

[0059] As Figure 4 shown, the transition section 3 includes a first fixing seat 31 forming its input end and a second fixing seat 32 forming its output end. The second fixing seat 32 is connected to the flange of the expansion section 4.

[0060] The first fixing seat 31, the body of the transition section 3, and the second fixing seat 32 are connected in sequence.

[0061] The first fixing seat 31 is aligned with the open-end fixing seat 22, and a second opening 311 that penetrates the first fixing seat 31 is provided on it. The second opening 311 allows the movable end of the diaphragm clamping mechanism to pass through.

[0062] The second opening 311 and the first opening 221 are arranged corresponding to each other. That is, one second opening 311 corresponds to one first opening 221.

[0063] As Figure 7As shown, the diaphragm clamping mechanism has its housing adsorbed to the transition section body of the transition section 3 through a suction cup. Its movable end sequentially passes through the second opening 311 and the first opening 221 to clamp the high-pressure driving section 2 and the transition section 3. Before the diaphragm clamping mechanism works, the high-pressure driving section 2 and the transition section 3 are aligned and in contact.

[0064] Among them, one end of the suction cup is connected to the main body (housing) of the diaphragm clamping mechanism, and the other end is the adsorption end, which is adsorbed to the transition section 3.

[0065] In this example, the clamping mechanism is a hydraulic jack, and its piston forms its movable end.

[0066] As Figure 5 shown, the extension section 4 has a pyramid structure for its body, and the cross-section of its large end is a square cross-section. Considering that the building floor height in our country is about 3m and the spans of components such as beams, slabs and columns are about 3m, in order to meet the needs of carrying out full-scale tests and ensure the uniformity of the load, its cross-sectional size is not less than 3m×3m.

[0067] Furthermore, the length range of the high-pressure driving section 2 is 2m - 5m.

[0068] As Figure 6 shown, the pressure relief section 5 is a rigid frame structure, and a number of pressure relief holes 51 are opened on its outer wall.

[0069] A overpressure sensor 52 is arranged at the center of the top surface of the pressure relief section 5 for measuring the reflected overpressure load acting on the surface of the component.

[0070] The pressure relief section 5 and the extension section 4 are connected by bolts.

[0071] As Figure 6 shown, the pressure relief section 5 includes: a first frame, a pressure relief section body and a second frame connected in sequence.

[0072] The inner frames of the first frame and the second frame are both fixed to the pressure relief section body, and both the first frame and the second frame extend perpendicularly outward in the axial direction.

[0073] Pressure relief holes 51 are opened on the pressure relief section body.

[0074] The first frame is fixed to the large end of the extension section 4 by bolts, and the second frame is fixed to the structural member to be tested.

[0075] In this embodiment, "positive pressure holding time" refers to the time experienced when the pressure suddenly jumps from the ambient pressure to the maximum value and then returns to the ambient pressure.

[0076] The working principle of this shock tube test device:

[0077] During the test, the air compressor fills the high-pressure driving section with high-pressure driving gas through the steam injection hole. When the pressure difference across the membrane reaches the critical value, the diaphragm ruptures, and then the driving gas in the high-pressure driving section expands, flows into the transition section, and generates a shock wave.

[0078] The driving gas further expands in the expansion section, forming a uniformly distributed overpressure load similar to the explosion shock wave, which acts on the structural member to be tested installed at the end of the pressure relief section;

[0079] Then, the overpressure load is reflected at the structural member and discharged from the pressure relief holes on the side of the pressure relief section. The explosion load measured at the center of the top surface of the pressure relief section can represent the reflected overpressure load acting on the surface of the member.

[0080] Among them, the pressure relief holes can reduce the secondary wave and the tertiary wave generated by the multiple reflections of the shock wave in the shock tube test device.

[0081] The above are only the preferred embodiments of the present utility model and do not impose any limitation on the present utility model. Any person skilled in the art, within the scope of the technical solution of the present utility model, makes any form of equivalent replacement or modification and other changes to the technical solution and technical content disclosed by the present utility model, which are all within the content of the technical solution of the present utility model and still fall within the protection scope of the present utility model.

Claims

1. A variable cross-section shock tube test device with adjustable positive pressure holding time, characterized in that, Comprising: An air compressor (1); And a high-pressure drive section (2), a transition section (3), an expansion section (4) and a pressure relief section (5), which are connected in sequence, and the high-pressure drive section (2) is connected to the air compressor (1) through a pipeline; For the transition section (3), a diaphragm (33) is provided at the connection with the high-pressure drive section (2); For the expansion section (4), its small end is connected to the transition section (3) through a flange, and its large end is connected to the pressure relief section (5); The output end of the pressure relief section (5) is connected to the structural member to be tested; A diaphragm clamping mechanism is provided between the high-pressure drive section (2) and the transition section (3).

2. The variable cross-section shock tube test device with adjustable positive pressure holding time according to claim 1, wherein The high-pressure drive section (2) includes a closed-end fixing seat (21), a high-pressure drive section body and an open-end fixing seat (22) that are connected in sequence; For the closed-end fixing seat (21), an air injection hole (211) is opened thereon, one end thereof facing the air compressor (1) is closed, and it is communicated with the high-pressure drive section body through the air injection hole (211), and the air compressor (1) injects driving gas into the high-pressure drive section (2) through the air injection hole (211); The open-end fixing seat (22) is of a ring structure, and its inner ring is fixed to the high-pressure drive section body; For the open-end fixing seat (22), a first opening (221) that penetrates the open-end fixing seat (22) axially is opened thereon; the first opening (221) allows the movable end of the diaphragm clamping mechanism to pass through; The transition section (3) includes a first fixing seat (31) forming its input end, a second fixing seat (32) forming its output end, and the second fixing seat (32) forming its output end is flange-connected to the expansion section (4); The first fixing seat (31) is aligned with the open-end fixing seat (22), and a second opening (311) penetrating the first fixing seat (31) is provided thereon, and the second opening (311) allows the movable end of the diaphragm clamping mechanism to pass through; the second opening (311) is correspondingly arranged with the first opening (221); For the diaphragm clamping mechanism, its main body is arranged in the transition section (3), and its movable end sequentially passes through the second opening (311) and the first opening (221) to clamp the high-pressure drive section (2) and the transition section (3).

3. The variable cross-section shock tube test device with adjustable positive pressure holding time according to claim 2, characterized in that The diaphragm clamping mechanism is a hydraulic jack, and its piston forms its movable end.

4. The variable cross-section shock tube test device with adjustable positive pressure holding time according to claim 2, wherein, The cross-section of the large end of the expansion section (4) is a square cross-section, and its cross-sectional dimension is not less than 3m×3m.

5. The positive pressure holding time adjustable variable cross-section shock tube test device according to claim 1, characterized in that, The length range of the high-pressure drive section (2) is 2m - 5m.

6. The test device of a variable cross-section shock tube with adjustable positive pressure holding time according to claim 1, characterized in that, The pressure relief section (5) is of a rigid frame structure, and a plurality of pressure relief holes (51) are opened on its outer wall.

7. The positive-pressure holding time adjustable variable cross-section shock tube test device according to claim 1, characterized in that A pressure sensor (52) is arranged at the center of the top surface of the pressure relief section (5).

8. The positive-pressure holding time adjustable variable cross-section shock tube test device according to claim 1, characterized in that, The pressure relief section (5) and the expansion section (4) are connected by bolts.

9. The positive pressure holding time adjustable variable cross-section shock tube test device according to claim 1, wherein, The expansion section (4) is made of steel material, and stiffening ribs are arranged on its outer surface.

10. The positive-pressure holding time adjustable variable cross-section shock tube test device according to claim 1, characterized in that, The high-pressure drive section (2), the transition section (3) and the expansion section (4) are all supported by supports; the high-pressure drive section (2) and the transition section (3) are both made of steel material.

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