Liquid oxygen cartridge igniter based on multi-spiral tungsten wire

Abstract

The utility model relates to the field of blasting engineering especially, a kind of liquid oxygen cartridge detonator based on multiple spiral tungsten filament ignition, including cartridge case, absorbent layer, exhaust pipe, liquid conveying pipe and ignition assembly, the inside of cartridge case is provided with absorbent layer, the inside of absorbent layer is provided with exhaust pipe, the inside of absorbent layer is provided with liquid conveying pipe, the inside of absorbent layer is provided with ignition assembly, ignition assembly includes spiral tungsten filament heating sheet and power supply wire, the inside of absorbent layer is provided with multiple spiral tungsten filament heating sheets, multiple spiral tungsten filament heating sheets are evenly distributed in the inside of absorbent layer, the top of spiral tungsten filament heating sheet is provided with power supply wire;The utility model uses multiple spiral tungsten filament heating sheet series connection to ensure that each ignition point works synchronously, improves heat transfer efficiency and liquid oxygen gasification speed by spiral tungsten filament structure, improves the success rate of ignition, shortens the deviation of detonation time, substantially improves the safety and reliability of blasting operation.

Description

Technical Field

[0001] This utility model relates to the field of blasting engineering technology, and in particular to a liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires. Background Technology

[0002] In the field of blasting engineering, efficient, safe, and environmentally friendly blasting technologies and devices have always been the core direction of research and development. Traditional blasting methods, such as the use of powdered explosives and emulsion explosives, have exposed many drawbacks, including environmental pollution, poor safety, and difficulties in storage and transportation, making it difficult to meet the increasingly stringent requirements of modern engineering. Liquid oxygen explosive blasting technology has emerged as a highly promising alternative. Liquid oxygen explosives are generally made by absorbing liquid oxygen from solid combustibles, and have advantages such as environmental friendliness, safety, and controllable blasting energy.

[0003] However, existing liquid oxygen charge detonation devices suffer from problems such as low ignition reliability, uneven energy distribution, and long ignition response time. Traditional single-point tungsten filament ignition is prone to ignition failure due to poor local contact, and the ignition energy is concentrated at one point, resulting in a limited contact area between the tungsten filament and the absorbent. Furthermore, the concentrated energy at a single point can easily lead to local overheating, while other areas of the charge may not be able to detonate synchronously due to the lag in heat transfer, which is not conducive to the overall uniform detonation of the liquid oxygen charge.

[0004] The core problem with existing technology is that the contact between a single tungsten wire and the absorbent is linear, with a small contact area. If the tungsten wire is locally oxidized or the absorbent is unevenly distributed, it can easily lead to ignition failure. The concentration of energy at a single point leads to significant differences in the vaporization rate of liquid oxygen. The area near the tungsten wire vaporizes and expands rapidly, while the area far from the ignition source may have delayed detonation due to heat conduction delay, resulting in a decrease in the utilization rate of explosive energy.

[0005] Therefore, to address the aforementioned issues, a liquid oxygen charge initiation device based on multi-spiral tungsten filament ignition is proposed. Multiple sets of spiral tungsten filament heating elements are evenly distributed within the absorbent layer and connected in series via conductive connecting pieces. This ensures synchronous operation of each ignition point, preventing single-point ignition failure. The spiral tungsten filament structure increases the contact area between the heating elements and the absorbent layer, improving heat transfer efficiency and the rate of liquid oxygen oxidation. This enhances the uniformity of heat distribution during ignition, optimizes heat transfer efficiency, increases the ignition success rate, shortens the detonation time deviation, and significantly improves the safety and reliability of blasting operations. Utility Model Content

[0006] In order to overcome the problems of low ignition reliability, uneven energy distribution and long ignition response time in the daily use of traditional liquid oxygen charge detonation devices.

[0007] The technical solution of this utility model is as follows: a liquid oxygen explosive charge initiation device based on the ignition of multiple spiral tungsten filaments, comprising an explosive charge shell, an absorbent layer, an exhaust pipe, an infusion pipe, and an ignition assembly. The absorbent layer is disposed inside the explosive charge shell, the exhaust pipe is disposed inside the absorbent layer, the infusion pipe is disposed inside the absorbent layer, and the ignition assembly is disposed inside the absorbent layer. The ignition assembly includes a spiral tungsten filament heating element and a power supply line. Multiple sets of spiral tungsten filament heating elements are disposed inside the absorbent layer, and the multiple sets of spiral tungsten filament heating elements are evenly distributed inside the absorbent layer. The power supply line is disposed above the spiral tungsten filament heating elements, one end of which is connected to an external power source, and the other end of the power supply line is adjacent to the spiral tungsten filament heating element. The ports of the exhaust pipe and the infusion pipe are located at one end of the explosive charge shell.

[0008] Preferably, multiple sets of spiral tungsten wire heating plates are evenly distributed in the absorbent layer and connected in series by conductive connecting plates to ensure that each ignition point works synchronously and prevent single-point ignition failure. The spiral tungsten wire structure increases the contact area between the spiral tungsten wire heating plate and the absorbent layer, improving heat transfer efficiency and liquid oxygenation rate. The exhaust pipe is used to stabilize the gas pressure balance inside the explosive charge shell, thereby improving the uniformity of heat distribution during ignition and optimizing heat transfer efficiency, increasing the ignition success rate, shortening the detonation time deviation, and significantly improving the safety and reliability of blasting operations.

[0009] Preferably, there are at least two sets of spiral tungsten wire heating elements, one end of which is provided with a conductive connecting piece, and multiple sets of spiral tungsten wire heating elements are connected in series through the conductive connecting piece and the power supply line.

[0010] Preferably, the conductive connecting piece is a copper-nickel alloy piece.

[0011] Preferably, the absorbent layer is composed of multiple layers of wood pulp paper rolls, each with a porosity of 60% to 80%.

[0012] Preferably, the absorbent layer has an axial through hole on its inner side, and the spiral structure of multiple sets of spiral tungsten wire heating elements is uniformly extended and distributed along the radial direction of the axial through hole.

[0013] Preferably, the outer shell of the medicine package is made of polyethylene soft film with a temperature resistance range of -200℃ to 100℃.

[0014] Preferably, the exhaust pipe is a polyethylene hose, and the infusion pipe is a polyethylene hose.

[0015] As a preferred option, the power supply line is specifically a double-insulated copper core wire with a core wire diameter of 0.8~1.2mm and an insulation layer thickness of 0.3~0.5mm.

[0016] Preferably, a temperature sensor is installed inside the medicine package shell, and a signal line is installed below the temperature sensor, which is connected to an external detection device.

[0017] Preferably, the temperature sensor is a platinum resistance temperature sensor with a measurement range of -200℃ to 300℃.

[0018] The beneficial effects of this utility model are:

[0019] This invention employs multiple sets of spiral tungsten wire heating elements evenly distributed within the absorbent layer and connected in series via conductive connecting pieces. This ensures synchronous operation of each ignition point, preventing single-point ignition failure. The spiral tungsten wire structure increases the contact area between the spiral tungsten wire heating elements and the absorbent layer, improving heat transfer efficiency and the rate of liquefied oxygenation. The exhaust pipe stabilizes the internal pressure balance of the explosive charge, thereby improving the uniformity of heat distribution during ignition and optimizing heat transfer efficiency. This increases the ignition success rate, shortens the detonation time deviation, and significantly enhances the safety and reliability of blasting operations. Attached Figure Description

[0020] Figure 1 The diagram shown is a three-dimensional structural schematic of the liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to this utility model.

[0021] Figure 2 The diagram shown is a three-dimensional cross-sectional view of the liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to this utility model.

[0022] Figure 3 The diagram shown is a partial structural schematic of the liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to this utility model.

[0023] Figure 4 The diagram shown is a partial structural schematic of the liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Medicine pack shell; 2. Absorbent layer; 3. Exhaust pipe; 4. Infusion tube; 5. Axial through hole; 101. Spiral tungsten wire heating element; 102. Power supply line; 103. Conductive connecting piece; 6. Temperature sensor; 7. Signal line. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please see Figure 1 and Figure 2This utility model provides an embodiment: a liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten filaments, comprising a charge shell 1, an absorbent layer 2, an exhaust pipe 3, an infusion pipe 4, and an ignition assembly. The absorbent layer 2 is disposed inside the charge shell 1, the exhaust pipe 3 is disposed inside the absorbent layer 2, the infusion pipe 4 is disposed inside the absorbent layer 2, and the ignition assembly is disposed inside the absorbent layer 2. The ignition assembly includes spiral tungsten filament heating elements 101 and a power supply line 102. Multiple sets of spiral tungsten filament heating elements 101 are disposed inside the absorbent layer 2, and the multiple sets of spiral tungsten filament heating elements 101 are evenly distributed inside the absorbent layer 2. A power supply line 102 is provided above 101. One end of the power supply line 102 is connected to an external power source, and the other end of the power supply line 102 is adjacent to a spiral tungsten wire heating element 101. The ports of the exhaust pipe 3 and the infusion pipe 4 are located at one end of the medicine pack shell 1. Multiple sets of spiral tungsten wire heating elements 101 are evenly distributed in the absorbent layer 2 and connected in series through conductive connecting pieces 103 to ensure that each ignition point works synchronously and to prevent single-point ignition failure. The spiral tungsten wire structure increases the contact area between the spiral tungsten wire heating element 101 and the absorbent layer, improving the heat transfer efficiency and the liquid oxygenation rate. The exhaust pipe 3 is used to stabilize the gas pressure balance inside the medicine pack shell 1.

[0027] Please see Figure 3 and Figure 4 In this embodiment, the number of spiral tungsten filament heating elements 101 is at least two sets. One end of each spiral tungsten filament heating element 101 is provided with a conductive connecting piece 103. Multiple sets of spiral tungsten filament heating elements 101 are connected in series via the conductive connecting piece 103 and the power supply line 102. This series connection ensures that each set of spiral tungsten filament heating elements 101 can be simultaneously energized and heated, achieving a reliable electrical connection between the multiple sets of spiral tungsten filament heating elements 101 and ensuring uniform current distribution. The conductive connecting piece 103 is specifically a copper-nickel alloy sheet. The excellent conductivity and high-temperature stability of gold enable reliable connection, improving the conductivity and high-temperature resistance of the conductive connector. The absorbent layer 2 is composed of multiple layers of wood pulp paper rolls, each with a porosity of 60%~80%. The porous structure of the wood pulp paper rolls efficiently absorbs and stores liquid oxygen, improving the absorption capacity and storage stability of liquid oxygen. An axial through hole 5 is provided on the inner side of the absorbent layer 2. The spiral structure of multiple sets of spiral tungsten wire heating plates 101 extends and is evenly distributed radially along the axial through hole 5. The radially uniform distribution ensures that all parts of the medicine pack are heated simultaneously, achieving a uniform distribution of ignition energy.

[0028] The medicine pack shell 1 is made of polyethylene soft film with a temperature resistance range of -200℃ to 100℃. The low-temperature toughness and chemical stability of polyethylene material protect the contents of the medicine pack, ensuring its sealing and durability in low-temperature environments. The exhaust pipe 3 is specifically a polyethylene flexible tube, and the infusion tube 4 is specifically a polyethylene flexible tube. The flexibility and low-temperature resistance of polyethylene tubes enable reliable delivery, ensuring smooth liquid oxygen delivery and gas discharge. The power supply line 102 is specifically a double-insulated copper core wire with a core diameter of 0.8~1.2mm and an insulation layer thickness of 0.3~0.5mm, used to ensure stable power transmission. A temperature sensor 6 is installed inside the medicine pack shell 1, and a signal line 7 is located below the temperature sensor 6. The signal line 7 is connected to an external detection device, allowing real-time monitoring of the internal temperature changes of the medicine pack through the temperature sensor 6. The temperature sensor 6 is specifically a platinum resistance temperature sensor 6 with a measurement range of -200℃ to 300℃. The stable temperature characteristics of platinum resistance enable accurate measurement, ensuring high precision and stability of temperature measurement.

[0029] During operation, multiple layers of wood pulp roll paper are stacked to form an absorbent layer 2, which is then axially pressed to form a cylindrical structure with an axial through-hole 5 at the center. At least two sets of spiral tungsten wire heating elements 101 are evenly distributed radially along the axial through-hole 5. Each set of spiral tungsten wire heating elements 101 is made of tungsten wire wound into a spiral three-dimensional structure. The heating elements are connected in series by copper-nickel alloy conductive connecting pieces 103, which are fixed to the ends of the tungsten wires using laser welding. The assembled heating element assembly is then embedded inside the absorbent layer 2, ensuring full contact between the spiral structure and the wood pulp roll paper. A polyethylene soft film is wrapped around the outside of the absorbent layer 2 to form the medicine pack shell 1, and both ends are sealed by hot melt welding. A polyethylene exhaust pipe 3 and an infusion tube 4 are inserted in parallel at one end of the medicine pack. The end of the exhaust pipe 3 extends to the inside of the medicine pack near the shell, and the end of the infusion tube 4 extends into the bottom of the axial through hole 5 of the absorbent layer 2. Finally, one end of the double-insulated copper core power supply wire 102 is connected to the first set of spiral tungsten wire heating elements 101, and the other end extends to the outside of the medicine pack to form a power interface. A platinum resistance temperature sensor 6 is attached to the middle of the inner wall of the medicine pack shell 1 and connected to an external detection device through a signal line 7.

[0030] Liquid oxygen is injected into the absorbent layer 2 through the infusion tube 4, and uniform absorption is achieved by utilizing the capillary action of the wood pulp roll paper. The injection is stopped when liquid oxygen backflow occurs at the outlet of the infusion tube 4. The unobstructedness of the exhaust pipe 3 is checked to ensure that the internal air pressure of the explosive pack can be automatically adjusted by the thermal expansion and contraction characteristics of the polyethylene hose. The power supply line 102 is connected to the external pulse power supply to perform zero-point calibration on the platinum resistance temperature sensor 6. The temperature acquisition module is connected to the blasting control system through the signal line 7 to monitor the temperature change curve inside the explosive pack in real time. When operating in a low-temperature environment, the explosive pack is preheated with an electric heating tape to ensure that the liquid oxygen remains liquid and the wood pulp roll paper structure is stable.

[0031] During detonation: The external pulse power supply is activated, and the current is transmitted to the first set of spiral tungsten wire heating elements 101 through double-insulated copper core wires. Multiple heating elements are simultaneously energized through copper-nickel alloy conductive connecting pieces 103. After being energized, the spiral tungsten wire heating elements 101 heat up. The contact area between its spiral structure and the wood pulp roll is increased compared to traditional straight tungsten wires, which promotes the liquid oxygen to complete the phase change and vaporization. The temperature sensor 6 provides real-time feedback on the temperature field distribution inside the explosive charge. The high-pressure gas generated by the vaporization of liquid oxygen is released directionally through the exhaust pipe 3 to prevent the explosive charge shell 1 from rupturing and splashing.

[0032] Through the above steps, multiple sets of spiral tungsten wire heating plates 101 are evenly distributed in the absorbent layer 2 and connected in series by conductive connecting pieces 103 to ensure that each ignition point works synchronously and to prevent single-point ignition failure. The spiral tungsten wire structure increases the contact area between the spiral tungsten wire heating plate 101 and the absorbent layer, improving the heat transfer efficiency and the liquefied oxygenation rate. The exhaust pipe 3 is used to stabilize the gas pressure balance inside the explosive charge shell 1, thereby improving the uniformity of heat distribution during ignition and optimizing the heat transfer efficiency, increasing the ignition success rate, shortening the detonation time deviation, and significantly improving the safety and reliability of blasting operations.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires, comprising a charge shell (1), an absorbent layer (2), an exhaust pipe (3), and a delivery pipe (4), characterized in that: It also includes an ignition assembly. An absorbent layer (2) is provided inside the medicine pack shell (1). An exhaust pipe (3) is provided inside the absorbent layer (2). An infusion pipe (4) is provided inside the absorbent layer (2). An ignition assembly is provided inside the absorbent layer (2). The ignition assembly includes a spiral tungsten wire heating plate (101) and a power supply line (102). Multiple sets of spiral tungsten wire heating plates (101) are provided inside the absorbent layer (2). Multiple sets of spiral tungsten wire heating plates (101) are evenly distributed inside the absorbent layer (2). A power supply line (102) is provided above the spiral tungsten wire heating plate (101). One end of the power supply line (102) is connected to an external power source. The other end of the power supply line (102) is adjacent to the spiral tungsten wire heating plate (101). The ports of the exhaust pipe (3) and the infusion pipe (4) are located at one end of the medicine pack shell (1).

2. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 1, characterized in that: The number of spiral tungsten wire heating elements (101) is at least two sets. One end of the spiral tungsten wire heating element (101) is provided with a conductive connecting piece (103). Multiple sets of spiral tungsten wire heating elements (101) are connected in series through the conductive connecting piece (103) and the power supply line (102).

3. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 2, characterized in that: The conductive connecting piece (103) is specifically a copper-nickel alloy piece.

4. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 1, characterized in that: The absorbent layer (2) is composed of multiple layers of wood pulp paper rolls, each with a porosity of 60% to 80%.

5. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 1, characterized in that: An axial through hole (5) is provided on the inner side of the absorbent layer (2), and the spiral structure of multiple sets of spiral tungsten wire heating plates (101) is uniformly extended and distributed along the radial direction of the axial through hole (5).

6. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 1, characterized in that: The outer shell of the medicine pack (1) is a polyethylene soft film with a temperature resistance range of -200℃ to 100℃.

7. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 1, characterized in that: The exhaust pipe (3) is specifically a polyethylene hose, and the infusion pipe (4) is specifically a polyethylene hose.

8. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 1, characterized in that: The power supply line (102) is specifically a double-insulated copper core wire with a core wire diameter of 0.8~1.2mm and an insulation layer thickness of 0.3~0.5mm.

9. The liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 1, characterized in that: A temperature sensor (6) is installed inside the medicine pack shell (1), and a signal line (7) is installed below the temperature sensor (6). The signal line (7) is connected to an external detection device.

10. A liquid oxygen charge initiation device based on the ignition of multiple spiral tungsten wires according to claim 9, characterized in that: The temperature sensor (6) is specifically a platinum resistance temperature sensor (6), and the temperature sensor (6) has a measurement range of -200℃ to 300℃.

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