A fireworks shell launching device

Abstract

A firework shell launching device comprises a gas generator and a launching tube; the upper end of the launching tube is open, and the gas generator is pressed into the launching tube from the lower end and is flush with the bottom end of the launching tube; the gas generator comprises a wire, an electric ignition head, a plugging screw, propellant, a powder cup, a pressure control chamber and a shell; the powder cup is sealed inside the pressure control chamber by the plugging screw, and the powder cup and the side wall of the pressure control chamber are interference fit; the propellant is arranged in the powder cup; the electric ignition head is arranged on the plugging screw, one end of the electric ignition head is connected to the propellant, and the other end is connected to the wire extending outside the launching tube; the utility model has the following beneficial effects: the double-layer structure of the utility model has an effective energy utilization rate, and can be moisture-proof and anti-deterioration; at the same time, it also ensures a stable exit speed, a high control accuracy of the firing height, a high launching success rate, and can be reused and can also be suitable for launching the same or different types of firework shells, effectively reducing the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of fireworks, in particular to a smokeless display shell launching device. Background Art

[0002] The existing fireworks shell launching structure includes propellant and fuse. After the fireworks shell is ignited, the fuel is propelled into the launch tube. The fuel is confined in a certain space. For example, the heat and gas gathered at the bottom of the spherical fireworks will generate intense tension in the launch tube. When it explodes, the air expands rapidly, pushing the fireworks, generating a large initial velocity and rushing into the sky.

[0003] Existing fireworks shells are loaded with black powder as the propellant. Black powder is mainly composed of solid particles such as potassium nitrate, sulfur and charcoal. During the combustion process, not only many solid particles are generated, resulting in a large amount of smoke, but also harmful gases such as sulfur oxides and carbon monoxide are produced. The loading method is relatively simple.

[0004] Defects and shortcomings of the existing technology:

[0005] 1. Black powder has a high flame sensitivity and is easily ignited by flame. It has a high mechanical sensitivity after combustion and its impact sensitivity explosion percentage is 50%. Its overall safety and stability are poor.

[0006] 2. Black powder has poor physical stability and is easily affected by moisture and deterioration. When burning, it will produce high-temperature smoke and dust. Especially when the gunpowder is affected by moisture and deterioration, the substances produced by incomplete combustion will pollute the environment.

[0007] 3. Currently, simple paper tubes and small steel cannons are used to set off fireworks. Their structural safety performance is low, and it is difficult to ensure the pressure required for the complete combustion of black powder. At the same time, when the elastic performance of fireworks is unstable, it is easy to cause personal injury to the person setting them off.

[0008] Therefore, it is necessary to research a fireworks shell launching device with environmentally friendly propellant and stable performance. Utility Model Content

[0009] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and to provide a display shell launching device which has simple structure, stable performance, high launching safety, low cost and can be reused and is suitable for launching various types of fireworks.

[0010] The technical solution of the utility model is:

[0011] A display shell launching device comprises a gas generator and a launching tube; the upper end of the launching tube is open, and the gas generator is pressed into the launching tube from the lower end and is flush with the bottom end of the launching tube;

[0012] The gas generator includes a wire, an electric ignition head, a plugging screw, a propellant, a powder cup, a pressure control chamber and a shell; the powder cup is sealed inside the pressure control chamber by the plugging screw, and the powder cup and the side wall of the pressure control chamber are interference fit; the propellant is arranged in the powder cup; the electric ignition head is arranged on the plugging screw, one end of the electric ignition head is connected to the propellant, and the other end is connected to the wire extending outside the launch tube;

[0013] It also includes a low-pressure chamber formed between the housing, the pressure control chamber, and the display shell; a connecting channel with a shearing function is provided between the pressure control chamber and the low-pressure chamber, and the connecting channel is provided on the side wall of the pressure control chamber;

[0014] After the propellant burns, the powder cup expands in the pressure control chamber. Affected by the shear stress of the connecting channel, the powder cup is pierced by the high-pressure gas at the connecting channel. The high-pressure gas enters the low-pressure chamber through the channel and forms the launching gas required for launching the fireworks shells.

[0015] Furthermore, a device with a shearing function is provided in the connecting channel on the side wall of the pressure control chamber.

[0016] Furthermore, the shape, number and size of the connecting channels on the side wall of the control pressure chamber, as well as the thickness of the side wall of the powder cup and the amount of propellant charge, are adapted to the display shells required for launching in the launching tube.

[0017] Furthermore, there is an interference fit between the medicine bowl and the side wall of the pressure control chamber, and the interference amount is 0.05mm.

[0018] Furthermore, the housing and the control pressure chamber are connected with a clearance fit, and the clearance is 0.1 mm.

[0019] Furthermore, the shell and the launching tube are connected by interference fit, and the interference amount is 0.1mm.

[0020] Preferably, the propellant is black powder.

[0021] Preferably, the medicine bowl and the pressure control chamber are made of brass.

[0022] The launch tube is open at the top and sealed at the bottom, with a wire hole at the bottom for the wire to extend out; the gas generator is pressed into the launch tube from the top and is flush with the bottom of the launch tube.

[0023] Beneficial effects of the utility model:

[0024] (1) The utility model can ensure the full combustion of the propellant in the powder bowl through the double-layer structure of the powder bowl and the control pressure chamber, based on the original propellant being single-base or multi-base propellant such as black powder, nitrocellulose or RDX; and ensure the micro-smoke generation during the launch of the display shells. Compared with the existing display shell launchers, the combustion efficiency of the propellant is greatly improved, and the energy utilization rate of the gunpowder is improved.

[0025] (2) The propellant in the powder cup of the utility model is sealed and preserved by the plugging screw, which ensures that the display shell launching device is safer and more reliable in transportation and storage, and can also prevent moisture and deterioration;

[0026] (3) During the launch process, the powder cup of the utility model is cut at the connecting channel under the shearing action of the internal high-pressure gas and the external connecting channel, thereby connecting the pressure control chamber and the low-pressure chamber. After the high-pressure gas enters the low-pressure chamber, it can form a stable launching force required for launching a display shell;

[0027] At the same time, the utility model can also effectively control the maximum pressure value of the gas generated by the medicine cup and the pressure value of the emission gas by controlling the number, shape, size and thickness of the connecting channels on the pressure chamber side, thereby ensuring the safety and stability of the emission process.

[0028] (4) The utility model has a stable ejection speed of the fireworks, a high control accuracy of the firing height of the fireworks, a high firing success rate, and can achieve a better firing effect.

[0029] (5) The method of the utility model solves the problems of backward technology and complicated assembly process of existing firework shell launchers. After the launch is completed, the same or different types of firework shells can be repeatedly launched by replacing new powder cups, plugging screws, electric ignition heads and wires, which effectively reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0032] Figure 3 It is a schematic diagram of the structure of the gas generator in the device of the utility model;

[0033] Figure numerals: 1. Wire; 2. Electric ignition head; 3. Plug screw; 4. Propellant; 5. Powder bowl; 6. Control pressure chamber; 7. Low pressure chamber; 8. Launch tube; 9. Firework shell; 10. Gas generator; 11. Connecting channel. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Embodiment 1

[0036] like Figure 1 to Figure 3 As shown: a display shell launching device, comprising a gas generator 10 and a launching tube 8; the upper end of the launching tube is open, and the gas generator 10 is pressed into the launching tube 8 from the lower end and is flush with the bottom end of the launching tube 8;

[0037] The gas generator 10 includes a wire 1, an electric ignition head 2, a plugging screw 3, a propellant 4, a powder cup 4, a pressure control chamber 6 and a shell; the powder cup 4 is sealed inside the pressure control chamber 6 by the plugging screw 3, and the powder cup 4 and the side wall of the pressure control chamber 6 are interference fit; the propellant 4 is arranged in the powder cup 4; the electric ignition head 2 is arranged on the plugging screw 3, one end of the electric ignition head 2 is connected to the propellant 4, and the other end is connected to the wire 1 extending to the outside of the launch tube 8;

[0038] It also includes a low-pressure chamber 7 formed between the housing, the pressure control chamber 6, and the display shell 9; a connecting channel 11 with a shearing function is provided between the pressure control chamber 6 and the low-pressure chamber 7, and the connecting channel 11 is provided on the side wall of the pressure control chamber 6;

[0039] After the propellant 4 burns, the powder cup 4 expands in the control pressure chamber 6. Affected by the shear stress of the connecting channel 11, the powder cup 4 is pierced by the high-pressure gas at the connecting channel 11. The high-pressure gas enters the low-pressure chamber 7 through the channel to form the launching gas required for launching the display shell 9.

[0040] In this embodiment, the hole at the contact position between the connecting channel 11 and the medicine bowl 4 can be provided with a sharp shape, a thin blade shape, etc. for easy puncture or cutting, or a weak position can be set at the contact position between the medicine bowl 4 and the connecting channel 11 for easy puncture or cutting.

[0041] Furthermore, a device with a shearing function is provided in the connecting channel 11 on the side wall of the pressure control chamber 6 .

[0042] Furthermore, the shape, number and size of the connecting channels 11 on the side wall of the control pressure chamber 6 , as well as the thickness of the side wall of the powder cup 4 and the charge of the propellant 4 are adapted to the display shells 9 required for launching in the launching tube 8 .

[0043] Furthermore, there is an interference fit between the medicine bowl 4 and the side wall of the pressure control chamber 6, and the interference amount is 0.05 mm.

[0044] Furthermore, the housing and the control pressure chamber 6 are connected with a clearance fit, and the clearance is 0.1 mm.

[0045] Furthermore, the shell and the launching tube 8 are connected by interference fit, and the interference amount is 0.1 mm.

[0046] Preferably, the propellant 4 of the utility model is black powder. The double-layer structure can ensure the full combustion of the black powder.

[0047] Preferably, the medicine bowl 4 and the pressure control chamber 6 of the utility model are made of brass. Other metal materials with the same toughness can also be used.

[0048] Embodiment 2:

[0049] The utility model can also adopt the existing launch tube 8, which is a structure with an open upper end and a sealed bottom end, and a wire hole is reserved at the bottom for the wire 1 to extend out; the gas generator 10 is pressed into the launch tube 8 from the upper end and is flush with the bottom end of the launch tube 8.

[0050] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A display shell launching device, characterized in that: It includes a gas generator and a launching tube; the upper end of the launching tube is open, and the gas generator is pressed into the launching tube from the lower end and is flush with the bottom end of the launching tube; The gas generator includes a wire, an electric ignition head, a plugging screw, a propellant, a powder cup, a pressure control chamber and a shell; the powder cup is sealed inside the pressure control chamber by the plugging screw, and the powder cup and the side wall of the pressure control chamber are interference fit; the propellant is arranged in the powder cup; the electric ignition head is arranged on the plugging screw, one end of the electric ignition head is connected to the propellant, and the other end is connected to the wire extending outside the launch tube; It also includes a low-pressure chamber formed between the housing, the pressure control chamber, and the display shell; a connecting channel with a shearing function is provided between the pressure control chamber and the low-pressure chamber, and the connecting channel is provided on the side wall of the pressure control chamber; After the propellant burns, the powder cup expands in the pressure control chamber. Affected by the shear stress of the connecting channel, the powder cup is pierced by the high-pressure gas at the connecting channel. The high-pressure gas enters the low-pressure chamber through the channel and forms the launching gas required for launching the fireworks shells.

2. A display shell launching device as claimed in claim 1, characterized in that: A device with a shearing function is arranged in the connecting channel on the side wall of the pressure control chamber.

3. A display shell launching device as claimed in claim 1, characterized in that: The hole at the contact position between the connecting channel and the medicine bowl is provided with a sharp portion or a thin blade portion for puncturing or cutting, or a weak position is provided at the contact position between the medicine bowl and the connecting channel for puncturing or cutting.

4. A display shell launching device as claimed in claim 1, characterized in that: The shape, number and size of the connecting channels on the side wall of the control pressure chamber, as well as the thickness of the side wall of the powder cup and the charge of the propellant are adapted to the display shells required for launching in the launching tube.

5. A display shell launching device as claimed in claim 1, characterized in that: The medicine bowl and the side wall of the pressure control chamber are in interference fit, and the interference amount is 0.05mm.

6. A display shell launching device as claimed in claim 1, characterized in that: The housing and the pressure control chamber are connected by clearance fit, and the clearance is 0.1 mm.

7. A display shell launching device as claimed in claim 1, characterized in that: The shell and the launching tube are connected by interference fit, and the interference amount is 0.1mm.

8. A display shell launching device as claimed in claim 1, characterized in that: The medicine bowl and the pressure control chamber are made of brass.

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