Explosion pressure buffer device of indoor kilometer underwater explosion container

Abstract

The explosion pressure buffering device of the indoor kilometer underwater explosion container comprises a hollow cylinder shell, flange covers are arranged at the upper end and the lower end of the hollow cylinder shell, a water inlet and outlet pipe is arranged on the side wall of the hollow cylinder shell, and conical bases are arranged on the inner sides of the flange covers; the inner side wall of the hollow cylindrical shell is provided with a pressure reduction plate of a hole net structure. A conical seat is arranged on the inner surface of the flange cover, explosion pressure shock waves can be laterally transferred, and in order to further enhance the bearing capacity of the buffer device, a pressure reduction plate with a hole net structure is arranged in the buffer device, the pressure reduction plate is of the hole net structure, a spherical circular truncated cone structure for reducing the pressure of a flow field is arranged in a hole, and the pressure reduction plate can be replaced in time after being damaged; the explosion pressure buffering device has the advantage of being low in cost, explosion pressure is buffered through the explosion pressure buffering device, explosion impact pressure of explosives directly acting on the underwater explosion container structure is reduced, and the explosive equivalent weight of the underwater explosion container structure design can be met.

Description

Technical Field

[0001] The invention belongs to the field of explosion pressure buffer devices, and in particular relates to an explosion pressure buffer device for an indoor kilometer-level underwater explosion container. Background Art

[0002] In view of the size and manufacturing cost of the indoor underwater explosion container, the explosion container is small in size and its wall thickness has limited bearing capacity, so the designed underwater explosion explosive equivalent is small, and large equivalent explosion test projects are often not possible. For example, the underwater explosion container device currently available at the blasting center of Wuhan University of Science and Technology can only simulate 200m underwater depth and 10gTNT equivalent. Therefore, it is urgent to design a set of buffer devices to reduce the underwater explosion pressure. Summary of the invention

[0003] To solve the above problems, we proposed an explosion pressure buffer device for indoor kilometer-level underwater explosion containers.

[0004] The technical solution of the present invention is as follows:

[0005] An explosion pressure buffer device for an indoor kilometer-level underwater explosion container comprises a hollow cylindrical shell, wherein flange covers are arranged at the upper and lower ends of the hollow cylindrical shell, the flange cover is used to seal the hollow cylindrical shell, water inlet and outlet pipes are arranged on the side wall of the hollow cylindrical shell, a conical seat is arranged on the inner side of the flange cover, a pressure relief plate with a mesh structure is vertically arranged on the inner side of the hollow cylindrical shell, and a plurality of guide grooves are arranged on the surface of the conical seat between the cone tip and the circumferential edge.

[0006] Furthermore, the pressure relief plate comprises a plurality of mesh units arranged in an array, each mesh unit comprises a rectangular frame and a spherical cone structure 8 , and the spherical cone structure 8 is arranged horizontally and fixed in the rectangular frame by a connecting rod 9 .

[0007] Furthermore, the hollow cylindrical shell is a three-layer composite structure, including an inner wall, a middle buffer layer and an outer layer arranged in sequence from the inside to the outside, the inner wall is a copper plate with a thickness of 3 to 5 mm, the middle buffer layer is a polystyrene foam board or a flexible rubber board with a thickness of 1 to 5 cm, and the outer layer is steel with a thickness of 2 to 3 cm.

[0008] Furthermore, the spherical cone structure includes a cone and a hemisphere, the hemisphere is arranged at the large end of the cone and faces the inner side of the hollow cylindrical shell, the radius of the hemisphere is r, the width of the rectangular frame is L2, the distance between the front end of the spherical cone structure and the front outer edge of the rectangular frame is L4, the distance between the rear end of the spherical cone structure and the rear outer edge of the rectangular frame is L3, and the width of the inner side of the rectangular frame is L1, then L2=5L4, 4r=L1, L3=(1 / 3~1 / 2)L4.

[0009] Furthermore, the flange cover is detachably connected to the hollow cylindrical shell via a screw, and a buffer spring is sleeved on the outer side of the screw.

[0010] Furthermore, the guide groove is wedge-shaped and its width gradually increases from the cone tip to the circumferential edge.

[0011] The present invention has the following beneficial technical effects:

[0012] The inner surface of the flange cover of the present invention is a conical seat, which can transfer the explosion pressure shock wave to the side. In order to further enhance the bearing capacity of the buffer device, a pressure relief plate with a mesh structure is arranged inside the present invention. The structure of the pressure relief plate is as follows: the pressure relief plate is a mesh structure, and a spherical cone structure for reducing the flow field pressure is arranged in the hole. When the pressure relief plate is damaged, it can be replaced in time, and has the characteristic of low cost. The explosion pressure is buffered by the explosion pressure buffer device, which reduces the impact pressure of the explosive explosion and directly acts on the underwater explosion container structure, which can meet the explosive equivalent designed for the underwater explosion container structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the underwater explosion container structure;

[0014] Figure 2 It is a structural schematic diagram of the present invention;

[0015] Figure 3 It is a structural schematic diagram of a spherical frustum structure;

[0016] Figure 4 It is a top view schematic diagram of the conical seat;

[0017] Figure 5 This is a schematic diagram of the front view of the conical seat.

[0018] In the figure, the components represented by each reference numeral are as follows:

[0019] 1. Hollow cylindrical shell; 2. Flange cover; 3. Inlet and outlet pipes; 4. Conical seat; 5. Intermediate buffer layer; 6. Pressure relief plate; 7. Rectangular frame; 8. Spherical cone structure; 9. Connecting rod; 10. Explosives; 11. Diversion groove DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0021] In view of the size and manufacturing cost of the indoor underwater explosion container, the explosion container is small in size and its wall thickness has limited bearing capacity, so the designed underwater explosion explosive equivalent is small, and large equivalent explosion test projects are often not possible. For example, the existing underwater explosion container device, such as Figure 1, can only simulate 200m underwater depth and 10g TNT equivalent. Therefore, it is urgent to design a buffer device to reduce the explosion pressure in water. This buffer device can not only increase the equivalent of explosives, but also avoid water leakage in underwater explosion container experiments above 1000m.

[0022] like Figure 2 As shown, an explosion pressure buffer device for an indoor kilometer-level underwater explosion container includes a hollow cylindrical shell 1, and flange covers 2 are arranged at the upper and lower ends of the hollow cylindrical shell 1. The flange cover 2 is used to seal the hollow cylindrical shell 1. Inlet and outlet pipes 3 are arranged on the side wall of the hollow cylindrical shell 1. A conical seat 4 is arranged inside the flange cover 2. A pressure relief plate 6 with a mesh structure is vertically arranged inside the hollow cylindrical shell 1. Figure 4-5 As shown, the surface of the conical seat 4 is provided with a plurality of guide grooves 11 between the cone tip and the circumferential edge. The guide grooves 11 are wedge-shaped and the width gradually increases from the cone tip to the edge. The guide grooves can facilitate the water flow to the inlet and outlet pipes provided on the side wall of the hollow cylindrical shell 1.

[0023] The hollow cylindrical shell 1 is a three-layer composite structure, including an inner wall, an intermediate buffer layer 5 and an outer layer arranged in sequence from the inside to the outside. The inner wall is a copper plate with a thickness of 3 to 5 mm, the intermediate buffer layer 5 is a polystyrene foam board or a flexible rubber board with a thickness of 1 to 5 cm, and the outer layer is steel with a thickness of 2 to 3 cm.

[0024] The upper and lower flange covers are connected to the container through screws (buffer springs are arranged on the outside to prevent the screws from being broken due to excessive impact pressure. At the same time, the movement of the cover plate can also unload part of the water pressure in the container). The inner surface of the flange cover is a conical seat to transfer the explosion pressure shock wave to the side. Inlet / outlet holes are arranged on the side wall of the cylindrical barrel. Water can be discharged laterally through the elbow pipe, and the high-pressure water flow in the cylindrical barrel is discharged through the elbow channel to relieve the effect of the explosion pressure on the pressure buffer device. At the same time, the high-pressure water flow dissipates the fluid energy by impacting each other through the upper and lower elbow channels.

[0025] The explosion pressure is buffered by the explosion pressure buffer device, which reduces the impact pressure of the explosive explosion directly acting on the underwater explosion container structure, thereby meeting the explosive equivalent designed for the underwater explosion container structure.

[0026] In order to further enhance the bearing capacity of the buffer device, that is, to enable it to withstand a larger explosive equivalent, a pressure relief plate with a mesh structure is arranged inside the buffer device, and the structure of the pressure relief plate is as follows.

[0027] like Figure 3As shown, the pressure relief plate 6 includes a plurality of mesh units arranged in an array, each mesh unit includes a rectangular frame 7 and a spherical cone structure 8, the spherical cone structure 8 is arranged horizontally and fixed in the rectangular frame 7 by a connecting rod 9, the spherical cone structure 8 is used to reduce the flow field pressure, the structure facing the explosion source is a semi-spherical surface, and the semi-spherical body is followed by a cone structure, which is connected to the frame by a connecting rod, and a plurality of such identical frame units are combined to form a pressure relief plate. The spherical cone structure includes a cone and a hemisphere, the hemisphere is arranged at the large end of the cone and faces the inner side of the hollow cylindrical shell 1, the radius of the hemisphere is r, the width of the rectangular frame is L2, the distance between the front end of the spherical cone structure and the outer edge of the front side of the rectangular frame is L4, the distance between the rear end of the spherical cone structure and the outer edge of the rear side of the rectangular frame is L3, and the width of the inner side of the rectangular frame is L1, then L2=5L4, 4r=L1, L3=(1 / 3~1 / 2)L4 are satisfied.

[0028] The pressure relief plate can be completed by using 3D printing technology, and the material can be acrylic material.

[0029] After the pressure relief plate is placed inside the buffer device, the equivalent of explosives in the test can be further increased. When the pressure relief plate is damaged, it can be replaced in time, and has the characteristics of low cost.

[0030] The steps of testing using the device of the present invention are as follows:

[0031] (1) Printing a cylindrical pressure relief plate using 3D printing technology;

[0032] (2) Place the pressure relief plate into the buffer device with the cover at one end already installed;

[0033] (3) Place the buffer device into the existing underwater explosion container device (either horizontally or vertically);

[0034] (4) Place the detonator and explosive 9 in the center of the buffer device, and pass the detonator corner line through the side inlet and outlet pipes;

[0035] (5) Install the cover on the other end of the buffer device;

[0036] (6) Close all hatches of the underwater explosion container device, fill with water, pressurize, and allow water to naturally enter the buffer device through the inlet and outlet pipes;

[0037] (7) Detonate and complete the blasting test.

[0038] The above is an example of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. An explosion pressure buffer device for an indoor kilometer-level underwater explosion container, characterized in that: The invention comprises a hollow cylindrical shell (1), wherein the upper and lower ends of the hollow cylindrical shell (1) are both provided with flange covers (2), the flange covers (2) are used to seal the hollow cylindrical shell (1), the side wall of the hollow cylindrical shell (1) is provided with water inlet and outlet pipes (3), a conical seat (4) is provided inside the flange cover (2), a pressure reducing plate (6) with a mesh structure is vertically provided inside the hollow cylindrical shell (1), and a plurality of guide grooves (11) are provided on the surface of the conical seat (4) between the cone tip and the circumferential edge.

2. The explosion pressure buffer device for an indoor kilometer-level underwater explosion container according to claim 1 is characterized in that: The pressure relief plate (6) comprises a plurality of mesh units arranged in an array, each mesh unit comprising a rectangular frame (7) and a spherical cone structure (8), and the spherical cone structure (8) is arranged horizontally and fixed in the rectangular frame (7) via a connecting rod (9).

3. The explosion pressure buffer device for an indoor kilometer-level underwater explosion container according to claim 1, characterized in that: The hollow cylindrical shell (1) is a three-layer composite structure, comprising an inner wall, an intermediate buffer layer (5) and an outer layer arranged in sequence from the inside to the outside, wherein the inner wall is a copper plate with a thickness of 3 to 5 mm, the intermediate buffer layer (5) is a polystyrene foam plate or a flexible rubber plate with a thickness of 1 to 5 cm, and the outer layer is a steel material with a thickness of 2 to 3 cm.

4. The explosion pressure buffer device for an indoor kilometer-level underwater explosion container according to claim 1, characterized in that: The spherical cone structure (8) comprises a cone and a hemisphere, wherein the hemisphere is arranged at the large end of the cone and faces the inner side of the hollow cylindrical shell (1). Assuming that the radius of the hemisphere is r, the width of the rectangular frame (7) is L2, the distance between the front end of the spherical cone structure (8) and the front outer edge of the rectangular frame (7) is L4, the distance between the rear end of the spherical cone structure (8) and the rear outer edge of the rectangular frame (7) is L3, and the width of the inner side of the rectangular frame (7) is L1, then L2=5L4, 4r=L1, and L3=(1 / 3-1 / 2)L4 are satisfied.

5. The explosion pressure buffer device for an indoor kilometer-level underwater explosion container according to claim 1, characterized in that: The flange cover 2 is detachably connected to the hollow cylindrical shell 1 via a screw, and a buffer spring is sleeved on the outer side of the screw.

6. The explosion pressure buffer device for an indoor kilometer-level underwater explosion container according to claim 1, characterized in that: The guide groove (11) is wedge-shaped and its width gradually increases from the cone tip to the edge.

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