A shock tube device for high pressure large area shock wave testing

Abstract

The utility model discloses a kind of shock tube devices for high-pressure large-area shock wave test, including buffer cylinder and shock tube body, the shock tube body includes gradually increasing circular tube section, conical transition section and square expansion section in turn and inside diameter, bursting disc is installed between the circular tube section and conical transition section, the end of the circular tube section is equipped with flange plug, the flange plug is connected with buffer cylinder;The outer circumferential surface of the conical transition section and square expansion section is equipped with several reinforcing plates, and each side plate of the square expansion section is plane panel.The shock tube body in the utility model installs bursting disc by circular tube section, buffer cylinder can buffer blasting pressure, balance the blasting pressure received by plugging end, square expansion section is the main flow area of blasting airflow, its radial dimension is larger, through the mode of plane panel splicing and external reinforcing plate consolidation, both can reduce processing difficulty, and can improve the structural strength of shock tube body.

Description

Technical Field

[0001] This utility model relates to the field of explosion testing technology, and in particular to a shock tube device for high-pressure large-area shock wave testing. Background Technology

[0002] Explosion tests are an important means of testing the explosion resistance and impact resistance of structures. Shock tubes are commonly used devices in explosion tests. Most explosion tests in the existing technology are used for low-pressure explosion tests. Therefore, the size of shock tubes is relatively small. For example, the shock tube diameter in patent number CN111766161A is less than 500mm, and the inner diameter of the shock tube in patent number CN212693143U is only 22mm. Shock tubes are relatively easy to manufacture, and the damage caused by the explosion pressure to the shock tube is also relatively low.

[0003] When the burst pressure increases, the stress surface of the corresponding test structure also increases. At this time, a larger shock tube is required for the burst test. Not only the processing cost of the shock tube, but also the structural stability of the shock tube needs to be considered.

[0004] Therefore, how to design a high-strength, low-cost high-pressure shock tube is a technical problem that needs to be solved. Utility Model Content

[0005] To address the technical problem that existing shock tubes are too small and have low structural strength, making them unsuitable for high-pressure explosion experiments, this invention provides a shock tube device for high-pressure, large-area shock wave testing to solve the aforementioned problems.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a shock tube device for high-pressure large-area shock wave testing, including a buffer cylinder and a shock tube body. The shock tube body includes a circular tube section, a conical transition section and a square expansion section connected in sequence with gradually increasing inner diameter. A rupture disc is installed between the circular tube section and the conical transition section. A flange plug is installed at the end of the circular tube section and the flange plug is connected to the buffer cylinder. Several reinforcing plates are provided on the outer circumferential surface of the conical transition section and the square expansion section. Each side plate of the square expansion section is a flat panel.

[0007] In an optional embodiment of this utility model, one end of the tapered transition section is a circular port that connects with the circular tube section, and the other end of the tapered transition section is a square port that connects with the square expansion section. The edges of the tapered transition section are transitioned with an arc-shaped surface.

[0008] In an optional embodiment of this utility model, the conical transition section includes an expansion short pipe and an expansion splicing pipe. The expansion short pipe is connected to the circular pipe section. The expansion splicing pipe is formed by splicing multiple panels. The end of the expansion splicing pipe is provided with a beam flange. The reinforcing plate includes several annular panels arranged around the expansion splicing pipe and the square expansion section, as well as several longitudinal stiffeners connecting adjacent annular panels or annular panels and beam flanges.

[0009] In an optional embodiment of this utility model, a plurality of supports are installed at the bottom of the shock tube body, and each support is provided with a roller.

[0010] In an optional embodiment of this utility model, the support includes a tall vertical frame connecting the circular pipe section, and the tall vertical frame is connected to the circular pipe section by clamps.

[0011] In an optional embodiment of this utility model, the bracket includes an inclined frame connecting the tapered transition section and a low vertical frame connecting the square expansion section. The inclined frame contacts the outer surface of the tapered transition section, and the low vertical frame is assembled with the annular panel.

[0012] In an optional embodiment of this utility model, the annular panel has an arc-shaped notch at the edge of the square expansion section.

[0013] In an optional embodiment of this utility model, the circular pipe segment is composed of multiple short pipes connected by connecting flanges.

[0014] In an optional embodiment of this utility model, the inner diameter of the square expansion section at the end furthest from the conical transition section is 3.5m to 4m.

[0015] In an optional embodiment of this utility model, a clamp is connected between the circular pipe section and the expansion short pipe, and the rupture disc is fixed on the clamp.

[0016] In an optional embodiment of this utility model, the clamp consists of two annular retaining rings arranged opposite each other. The opposing surfaces of the two annular retaining rings have mutually cooperating annular grooves and annular protrusions. The outer edge of the rupture disc is clamped between the two annular retaining rings, and the rupture disc has a bent portion that engages with the annular groove and the annular protrusion.

[0017] The beneficial effects of this utility model are: (1) The shock tube body in this utility model is equipped with a rupture disc through a circular tube section. The buffer cylinder can buffer the rupture pressure and balance the rupture pressure on the sealing end. The square expansion section is the test area with a large radial dimension. By splicing the flat panel and reinforcing it with an external reinforcing plate, the processing difficulty can be reduced and the structural strength of the shock tube body can be improved.

[0018] (2) The present invention has a support with rollers under the shock tube body, which makes it easy to move the whole device and also makes it easy to remove the round tube section to install the rupture disc. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a perspective view of the shock tube body in this utility model; Figure 2 yes Figure 1 Enlarged view of point a in the middle; Figure 3 yes Figure 1 Enlarged view at point b; Figure 4 This is a front view of a specific embodiment of the shock tube device for high-voltage large-area shock wave testing described in this utility model. Figure 5 yes Figure 4 A sectional view along line AA (buffer cylinder not shown); Figure 6 yes Figure 5 Enlarged view of point c in the middle.

[0021] In the diagram, 1. Buffer cylinder, 2. Shock tube body, 201. Circular tube section, 202. Conical transition section, 2021. Expansion short tube, 2022. Expansion splicing tube, 203. Square expansion section, 204. Flange plug, 205. Reinforcing plate, 2051. Annular panel, 2052. Longitudinal stiffener, 3. Arc-shaped surface, 4. Flat panel, 5. Beam flange, 6. Arc-shaped notch, 7. High vertical frame, 8. Roller, 9. Connecting flange, 10. Slanted frame, 11. Low vertical frame, 12. Clamp, 13. Rupture disc, 1301. Bending part, 14. Annular retaining ring, 1401. Annular groove, 1402. Annular protrusion. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] Example 1 like Figures 1-5As shown, a shock tube device for high-pressure, large-area shock wave testing includes a buffer cylinder 1 and a shock tube body 2. The shock tube body 2 includes a circular tube section 201, a conical transition section 202, and a square expansion section 203 connected sequentially with gradually increasing inner diameters. The end opening of the square expansion section 203 is used to install the product under test. The circular tube section 201 is the high-pressure zone, serving as the driving source for the entire flow process. The square expansion section 203 is the experimental zone. A rupture disc 13 is installed between the circular tube section 201 and the conical transition section 202. When the rupture disc 13 ruptures (mechanically, electrically, or spontaneously), high-pressure gas is generated within the circular pipe section 201 and rapidly expands, violently compressing and propelling the gas in the conical transition section 202 and the square expansion section 203 as the power drive area. Since the area of ​​the product under test is large, the square expansion section 203 is also large, while the rupture disc 13 is relatively small. The circular pipe section 201 can be configured with a smaller diameter to meet the installation requirements of the rupture disc 13. A flange plug 204 is installed at the end of the circular pipe section 201. The flange plug 204 is connected to the buffer cylinder 1. The buffer cylinder 1 can offset most of the burst pressure, preventing the flange plug 204 from rupturing.

[0024] The conical transition section 202 is relatively short, serving as a connecting transition. Each side plate of the square expansion section 203 is a flat panel 4, allowing the square expansion section 203 to be formed by welding multiple flat panels 4. This results in a simple structure and convenient installation. Several reinforcing plates 205 are provided on the outer periphery of both the conical transition section 202 and the square expansion section 203. Due to the large area of ​​the side plates of the conical transition section 202 and the square expansion section 203, the reinforcing plates 205 can suppress panel deformation after explosive impact. In this invention, the inner diameter of the square expansion section 203 at the end furthest from the conical transition section 202 can be 3.5m to 4m, and it can withstand shock wave pressures up to 15MPa.

[0025] like Figure 1 and Figure 2 As shown, one end of the tapered transition section 202 is a circular port that connects to the circular tube section 201, and the other end is a square port that connects to the square expansion section 203. The edges of the tapered transition section 202 are transitioned using an arc-shaped surface 3. The tapered transition section 202 includes an expansion short tube 2021 and an expansion splicing tube 2022. The expansion short tube 2021 is formed by machining a circular tube and connects to the circular tube section 201. The expansion splicing tube 2022 is formed by splicing multiple panels (including the arc-shaped surface 3) and is relatively short in length. The square expansion section 203 is formed entirely by splicing flat panels 4. Each flat panel 4 is inclined to the central axis of the shock tube body 2, forming a flared structure with an inner diameter that gradually increases along the shock wave direction.

[0026] Compared to the one-piece shock tube structure in the prior art, this utility model divides the shock tube body 2 into three parts: a circular tube section 201, a conical transition section 202, and a square expansion section 203. The conical transition section 202 and the square expansion section 203 are formed by panel splicing to form a large-diameter tube structure, and the structure is reinforced by a reinforcing plate 205. The circular tube section 201 serves as the installation area for the rupture disc 13, and the end is buffered by a buffer cylinder 1, which not only meets the requirements of high-pressure, large-diameter impact testing, but also extends the service life of the device.

[0027] Structure of reinforcing plate 205: The end of the expansion splice tube 2022 is provided with a beam flange 5. The reinforcing plate 205 includes several annular panels 2051 arranged around the expansion splice tube 2022 and the square expansion section 203, and several longitudinal stiffeners 2052 connecting adjacent annular panels 2051 or annular panels 2051 and the beam flange 5. Figures 3-5 As shown, the longitudinal stiffener 2052 is a short sheet structure. The leftmost longitudinal stiffener 2052 connects the beam flange 5 to the annular panel 2051. Then, the annular panel 2051 on the right is connected by multiple longitudinal stiffeners 2052 in sequence, thereby forming a continuous and stable reinforcing plate 205 outside the expansion splicing tube 2022 and the square expansion section 203, effectively preventing the shock tube body 2 from deforming.

[0028] Because the axial length of the square expansion section 203 is relatively large, in order to avoid structural deformation, the edges of the square expansion section 203 are not rounded. When subjected to shock waves, the edges will vibrate and deform due to stress concentration. In order to avoid damage to the annular panel 2051 due to excessive stress during the explosion, in the further design, the annular panel 2051 is provided with an arc-shaped notch 6 opposite the edge of the square expansion section 203.

[0029] Example 2 Based on the above embodiment, a clamp is connected between the circular pipe section 201 and the expansion short pipe 2021, and the rupture disc 13 is fixed on the clamp.

[0030] The structure of the clamp is as follows Figure 6 As shown, the clamp consists of two opposing annular retaining rings 14. The opposing surfaces of the two annular retaining rings have mating annular grooves 1401 and annular protrusions 1402. The outer edge of the rupture disc 13 is clamped between the two annular retaining rings 14, and the rupture disc 13 has a bent portion 1301 that engages between the annular groove 1401 and the annular protrusion 1402. The ends of the two annular retaining rings 14 are respectively sealed to the flanges at the ends of the expansion short pipe 2021 and the circular pipe section 201 via octagonal gaskets.

[0031] Example 3 Based on the above embodiment, several supports are installed at the bottom of the shock tube body 2, and each support is equipped with a roller 8. Since the shock tube device is large in size and weight and inconvenient to move, it is placed on the supports with rollers 8 for easy disassembly and movement.

[0032] For example, the circular pipe section 201 can be made up of multiple short pipes connected by the connecting flange 9. When it is necessary to install the rupture disc, the connecting flange 9 can be removed and the support corresponding to the short pipe can be moved.

[0033] Based on the structure of each part of the shock tube body 2, such as Figure 1 and Figure 5 As shown, the support includes a high vertical frame 7 connecting the circular pipe section 201, a diagonal frame 10 connecting the conical transition section 202, and a low vertical frame 11 connecting the square expansion section 203. Since the circular pipe section 201 has the smallest diameter, it is the highest above the ground. The height of the high vertical frame 7 is greater than that of the low vertical frame 11. The high vertical frame 7 is connected to the circular pipe section 201 by a clamp 12. The low vertical frame 11 is assembled with the annular panel 2051 outside the square expansion section 203, while the diagonal frame 10 contacts the outer surface of the conical transition section 202.

[0034] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0035] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A shock tube device for high-voltage, large-area shock wave testing, characterized in that: The device includes a buffer cylinder and a shock tube body. The shock tube body comprises a circular pipe section, a conical transition section, and a square expansion section that are connected in sequence and have gradually increasing inner diameters. A rupture disc is installed between the circular pipe section and the conical transition section. A flange plug is installed at the end of the circular pipe section and the flange plug is connected to the buffer cylinder. The outer periphery of the tapered transition section and the square expansion section is provided with several reinforcing plates, and each side plate of the square expansion section is a flat panel.

2. The shock tube device for high-voltage large-area shock wave testing according to claim 1, characterized in that: One end of the tapered transition section is a circular port that connects with the circular pipe section, and the other end of the tapered transition section is a square port that connects with the square expansion section. The edges of the tapered transition section are transitioned with an arc-shaped surface.

3. The shock tube device for high-voltage large-area shock wave testing according to claim 1, characterized in that: The conical transition section includes an expansion short tube and an expansion splicing tube. The expansion short tube is connected to the circular tube section. The expansion splicing tube is formed by splicing multiple panels. The end of the expansion splicing tube is provided with a beam flange. The reinforcing plate includes several annular panels arranged around the expansion splicing tube and the square expansion section, as well as several longitudinal stiffeners connecting adjacent annular panels or annular panels and beam flanges.

4. The shock tube device for high-voltage large-area shock wave testing according to claim 1, characterized in that: The shock tube body has several supports installed at its bottom, and each support is equipped with rollers.

5. The shock tube device for high-voltage large-area shock wave testing according to claim 4, characterized in that: The support includes a tall vertical frame that connects to the circular pipe section, and the tall vertical frame is connected to the circular pipe section by clamps.

6. The shock tube device for high-voltage large-area shock wave testing according to claim 4, characterized in that: The support includes a slanted frame connecting the tapered transition section and a low vertical frame connecting the square expansion section. The slanted frame contacts the outer surface of the tapered transition section, and the low vertical frame is assembled with the annular panel.

7. The shock tube device for high-voltage large-area shock wave testing according to claim 3, characterized in that: The annular panel has an arc-shaped notch at the edge of the square expansion section.

8. The shock tube device for high-voltage large-area shock wave testing according to claim 3, characterized in that: A clamp is connected between the circular pipe section and the expansion short pipe, and the rupture disc is fixed on the clamp.

9. The shock tube device for high-voltage large-area shock wave testing according to claim 1, characterized in that: The inner diameter of the square expansion section at the end furthest from the conical transition section is 3.5m to 4m.

10. The shock tube device for high-voltage large-area shock wave testing according to claim 8, characterized in that: The clamp consists of two annular retaining rings arranged opposite each other. The opposite surfaces of the two annular retaining rings have mutually cooperating annular grooves and annular protrusions. The outer edge of the rupture disc is clamped between the two annular retaining rings, and the rupture disc has a bent portion that engages between the annular groove and the annular protrusion.

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