Firework device based on powder combustion and ejection

Abstract

Disclosed in the present invention is a firework device based on powder combustion and ejection. The firework device comprises an injector connected to a pressurized fuel accommodating cavity, wherein the injector is connected to a mixing tube, the mixing tube is provided with inlets for air and powder, the mixing tube above the inlets is connected to an ejection port, an igniter is provided between the inlets and the ejection port, a nozzle of the injector feeds a fuel injection jet into the mixing tube, the fuel injection jet sucks the air and powder into the mixing tube to form a mixed airflow, and the mixed airflow is ignited by the igniter and then ejected through the ejection port. Firework ejection can be achieved without the need for preheating powder, thereby effectively simplifying the apparatus structure; in addition, a combination of sparks and flames can be presented, and the spark and flame effect presented by fireworks is completely simulated.

Description

A fireworks device based on powder combustion and eruption Technical Field

[0001] The invention relates to a fireworks device formed by powder combustion and eruption. Background Art

[0002] Prior art Chinese patents, such as those published (announced) CN105241316A, CN105258576A, CN105371707A, CN105854317A, and CN107121022A, disclose cold pyrotechnic eruption devices. These devices are intended to replace traditional gunpowder-based pyrotechnics, eliminating the need for gunpowder and thus the safety hazard. In these patents, combustion heating outside the feed tube wall is the key factor in powder excitation and ignition, thus achieving cold pyrotechnic eruption. Similar products from other applicants, such as "A Colored Cold Fireworks Emitting and Control Device - Publication (Announcement) No.: CN106767189A," which uses "heating coil heating"; "A Heating Body Device and Stage Cold Fireworks Equipment - Publication (Announcement) No.: CN216482556U," which uses "a heating module sheathed on the outer wall of the tube for conveying metal powder"; and "A Gunpowder-Free Environmentally Friendly Firework Machine - Publication (Announcement) No.: CN109000519A," which uses "a heating coil and a heat-insulating collar disposed sequentially on the outer surface of the feed pipe." All employ similar powder excitation and ignition methods.

[0003] To address the drawbacks of the above-mentioned devices, such as high inefficient energy consumption and monotonous color of a single device, Chinese patent document CN108827088A discloses "a powder combustion and spraying device that imitates the effect of cold light fireworks", which preheats and transports the powder by mixing high-pressure and high-temperature air with the powder.

[0004] However, all of these existing devices suffer from the following drawbacks: First, they require preheating the powder before the fireworks can be launched. This requires numerous components, resulting in a complex structure. Furthermore, the flow of powder between components requires coordinated structural and operational coordination, reducing operational reliability. For example, residual metal powder in the delivery channel can easily clump and cause blockages if it becomes damp. Second, existing devices can only produce the stellar effect of burning powder (referred to as sparks), whereas spray fireworks can produce a combination of sparks and flames (or flames). Therefore, these existing devices cannot fully simulate the pyrotechnic effects of fireworks.

[0005] Therefore, the existing device still needs to be improved. Summary of the Invention

[0006] In order to solve the above-mentioned drawbacks, the technical problem to be solved by the present invention is to provide a fireworks device based on powder combustion and eruption, which can realize fireworks eruption without preheating the powder, effectively simplifying the equipment structure; at the same time, it can present a combination of sparks and flames, completely simulating the fireworks effect presented by fireworks. In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is a fireworks device based on powder combustion and eruption, characterized in that it includes an ejector connected to a pressure fuel chamber, the ejector is connected to a mixing tube, the mixing tube is provided with an inlet for air and powder, the mixing tube above the inlet is connected to a nozzle, an igniter is provided between the inlet and the nozzle, the nozzle of the ejector sends a fuel jet into the mixing tube, the fuel jet draws air and powder into the mixing tube to form a mixed airflow, and the mixed airflow is ignited by the igniter and then ejected from the nozzle; the powder inlet on the mixing tube is connected to a powder silo, and the powder silo is provided with a quantitative adjustment mechanism.

[0007] In the above technical solution, the fuel may be a flammable liquid or a combustible gas. The powder includes pyrotechnic metal powders (such as titanium, copper, potassium, aluminum, lithium, etc.) and pyrotechnic raw material powders such as barium salts, strontium salts, sodium salts, and copper salts. It also supports the heating, ignition, and eruption of traditional pyrotechnic ingredients by removing components that increase temperature, promote combustion, and generate gas, making pyrotechnic displays safer.

[0008] To improve the reliability of igniting the powder, in one embodiment, a mixing tube above the inlet is connected to a combustion chamber. The cross-sectional area of ​​the combustion chamber is larger than the inner cavity of the mixing tube. The upper end of the combustion chamber is connected to an injection port. An igniter is provided in the combustion chamber. The nozzle of the injector delivers a fuel injection flow into the mixing tube. The fuel injection flow draws air and powder into the mixing tube to form a mixed flow. After the mixed flow is ignited in the combustion chamber, it is ejected from the injection port. The cross-sectional area of ​​the combustion chamber is larger than the inner cavity of the mixing tube, which effectively increases the passageway. A small portion of the mixed flow is diverted to the periphery of the main jet channel, forming a low-speed mixed flow that is easily ignited by the spark of the igniter, thereby igniting the entire mixed flow. Furthermore, a spoiler is provided in the combustion chamber to disrupt the mixed gas, forming a low-speed flow that is easy to ignite in the combustion chamber.

[0009] In one embodiment, the spoiler comprises an intermediate channel concentrically arranged with the mixing tube, with a diversion gap provided at the junction of the intermediate channel and the mixing tube. In a preferred embodiment, the intermediate channel has the same diameter as the mixing tube. In a preferred embodiment, the outer peripheral sidewall of the intermediate channel is provided with a plurality of axial grooves. Furthermore, an annular body is provided around the outer periphery of the axial grooves. This ensures turbulent ignition while facilitating high-speed ejection of powder and flame.

[0010] In another preferred embodiment, the spoiler has an expansion portion connecting the intermediate channel and the mixing tube, and the expansion portion is provided with a diversion hole, thereby ensuring the ignition of the spoiler and facilitating the high-speed ejection of powder and flames.

[0011] In one embodiment, the ejector nozzle is located in the center of the mixing tube, and air and powder inlets are provided on the sidewalls of the mixing tube, effectively utilizing the negative pressure effect generated by the high-speed fuel ejection flow to transport the powder and ignite and eject it after mixing with the air and fuel.

[0012] In one embodiment, the mixing tube is connected to a tapered tube, with an air inlet centrally located within the tapered tube. The annular gap between the tapered tube and the air inlet forms the ejector nozzle, and a powder inlet is provided on the sidewall of the mixing tube. This effectively utilizes the negative pressure effect generated by the high-speed fuel ejection flow to transport the powder and ignite and eject it after mixing with air and fuel.

[0013] In one embodiment, the fuel storage container is connected to the ejector via a control valve and a fuel pipeline. The fuel pipeline at the rear end of the control valve bypasses the combustion zone of the mixed gas before connecting to the ejector. The high temperature of combustion is used to preheat the fuel, increase the degree of vaporization, and increase the velocity of the fuel jet.

[0014] In one embodiment, the fuel storage container is connected to the ejector via a pressure boosting and accumulating mechanism, thereby effectively controlling and / or increasing the speed of the fuel jet.

[0015] In one embodiment, the fireworks device is mounted on a rotating bracket and is rotated by a driving member to shape the fireworks that eject powder.

[0016] In one embodiment, the powder hopper is connected to the powder inlet of the mixing tube via an electric or pneumatic dosing mechanism; the fuel storage device is equipped with a solenoid valve; and the pyrotechnic device is controlled by a remote control module, such as a wireless, Bluetooth, or remote control module, to effectively remotely control the pyrotechnic device.

[0017] The beneficial effects of the present invention are as follows: the Bernoulli principle is applied for the first time to a pyrotechnic device consisting of powder combustion and eruption. Fuel is ejected at an extremely high speed through an ejection device, creating a lower pressure at the air inlet at a suitable location on the airflow channel of the eruption ignition tube, thereby "sucking" more air and powder in. These are fully mixed with the fuel, reacting and burning vigorously. The high temperature generated by the flame causes the gas to expand further, increasing the pressure, causing the flame and ignited powder to be ejected simultaneously at a high speed, resulting in a combination of sparks and flames (or flames), completely simulating the pyrotechnic effect presented by fireworks. Fireworks eruption can be achieved without preheating the powder, and no additional air, heat, or power sources are required, effectively streamlining the device structure.

[0018] The powder silo can use the powder's own gravity to discharge the powder, and the adjustable quantitative discharge can be achieved by adjusting the knob. No additional power source is required, and automatic and continuous quantitative discharge control is achieved.

[0019] In the ejection ignition tube, the fuel, air, and powder are thoroughly mixed, allowing them to be directly ignited and ejected at high speed. The flame temperature ranges from 280°C to 1800°C, capable of igniting most commercially available firework metal powders (such as titanium, copper, potassium, aluminum, and lithium), as well as raw material powders such as barium salts, strontium salts, sodium salts, and copper salts. The powder size ranges from 1 to 3000 mesh, selected according to the needs. Smaller powders increase the surface area per unit volume, allowing the powder to ignite at temperatures between 300°C and 1500°C. It also supports the ignition and ejection of traditional firework compounds, enabling the display of a variety of cold light fireworks and pyrotechnic effects.

[0020] The igniter can be any device that produces sparks or electric sparks.

[0021] The device can realize the eruption of simulated fireworks without electrical or mechanical drive, and has the advantages of simple and compact structure, low cost and easy maintenance.

[0022] It can work in harsh environments such as high temperature, high pressure, and strong magnetic field, and has strong anti-interference ability.

[0023] The fireworks-like eruption equipment using this technical solution can be large or medium-sized eruption equipment placed on the ground, and it is also convenient to produce small eruption devices through miniaturization, such as handheld products.

[0024] The high-speed fuel jet creates a negative pressure zone above the nozzle, where the surrounding oxygen supply is insufficient, making it difficult to ignite the extremely high-velocity fuel fluid, effectively preventing backfire and ensuring safety. In a preferred embodiment, a one-way valve can also be installed on the fuel pipeline.

[0025] Therefore, the device of the present invention can display cold light fireworks and pyrotechnic effects of various flame colors. It has the advantages of rapid ignition, good uniformity of ejection speed, simple structure, safety and reliability. The ejected fuel rises with the hot air during combustion, so that the burning powder is carried to a higher place.

[0026] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. When an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an intervening element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an intervening element. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structural principle of Example 1 (including a partial enlarged view on the left);

[0029] Figure 2 is a schematic diagram of the overall structural principle of Example 2 (including a partial enlarged view on the left);

[0030] FIG3 is a schematic diagram of the partial principle structure of Example 2 (comparison between the assembled state and the separated state);

[0031] FIG4 is a schematic diagram of the combined structure of the mixing tube, combustion chamber and spoiler of Example 2;

[0032] FIG5 is a second schematic diagram of the combined structure of the mixing tube, combustion chamber and spoiler of Example 2;

[0033] FIG6 is a schematic diagram of a partial cross-sectional structure of the combination of the mixing tube, combustion chamber and spoiler of Example 2;

[0034] FIG7 is a second schematic diagram of a partial cross-sectional structure of the combination of the mixing tube, combustion chamber and spoiler of Example 2;

[0035] FIG8 is a schematic diagram of the combined structure of the middle channel, axial groove, and ring body of the spoiler of Example 2;

[0036] FIG9 is a schematic diagram of the combined structure of the axial groove and the ring body of the spoiler of Example 2;

[0037] FIG10 is a schematic structural diagram of the ejector of Example 3;

[0038] FIG11 is a schematic diagram of the spoiler structure of Example 4;

[0039] FIG12 is a schematic diagram of the spoiler structure of Example 5;

[0040] FIG13 is a schematic structural diagram of Example 6;

[0041] FIG14 is a schematic structural diagram of Example 7. DETAILED DESCRIPTION

[0042] Example 1: See Figure 1, which shows a specific structure of the present invention. The pyrotechnic device based on powder combustion and ejection includes an ejector 5 connected to a pressure fuel chamber 6, the ejector 5 connected to a mixing tube 14, the mixing tube 14 is provided with an air inlet 4 and a powder discharge port 3, a mixing tube 11 above the discharge port 3 is connected to an injection port 13, an igniter 9 is provided between the discharge port 3 and the injection port 13, the nozzle of the ejector 5 delivers a fuel injection flow 10 into the mixing tube 14, the fuel injection flow 10 draws air and powder into the mixing tube 14 from the air inlet 4 and the discharge port 3 to form a mixed flow 8, and the mixed flow 8 is ignited by the igniter 9 and ejected from the injection port 14.

[0043] In the above technical solution, the fuel is a combustible liquid or a combustible gas.

[0044] The powder includes pyrotechnic metal powders (such as titanium, copper, potassium, aluminum, and lithium) and raw material powders such as barium salts, strontium salts, sodium salts, and copper salts. It also supports the heating, ignition, and eruption of traditional pyrotechnic ingredients, eliminating components that increase temperature, promote combustion, and generate gas, making pyrotechnic displays safer. In this example, the pyrotechnic device includes a powder hopper 1 that discharges powder by gravity. This hopper is connected to a discharge port 3 on a mixing tube 14 via a quantitative adjustment switch 2.

[0045] In this example, the nozzle 15 of the ejector 5 is located at the bottom center of the mixing tube 14. The sidewall of the mixing tube 14 is provided with an air inlet 4 and a powder discharge port 3. The negative pressure effect generated by the high-speed fuel ejection flow 10 is utilized to transport the powder and ignite and eject it after mixing with air and fuel.

[0046] In the example, the pyrotechnic device comprises a housing 7 , a pressurized fuel chamber 6 provided with a control valve 11 and a fuel filling port 12 .

[0047] In other embodiments, the feed port 3 may also be provided at the air inlet 4 to simultaneously input air and powder.

[0048] Example 2: Referring to Figures 2-9, another specific structure of the present invention is reflected.

[0049] The accompanying drawings of Example 2 are marked with the following: 101. Powder silo; 102. Adjustment knob; 103. Feed port; 104. Air inlet; 105. Ejector; 106. Pressurized fuel chamber; 107. Outer shell; 108. Combustion chamber; 109. Turbulator; 110. Ignitor; 111. Mixing tube; 112. Fuel control valve; 113. Fuel filling port; 114. Injection port; 115. Ignition head; 116. Nozzle; 117. Intermediate channel; 118. Diverter gap; 119. Axial groove; 120. Ring body.

[0050] The difference from Example 1 is that, in order to improve the reliability of igniting the powder, in this example, the mixing tube 111 above the feed port 103 is connected to the combustion chamber 108, which is made of, for example, ceramic. The cross-sectional area of ​​the combustion chamber 108 is larger than the inner cavity of the mixing tube 111. The upper end of the combustion chamber 108 is connected to the injection port 114. The combustion chamber 108 is provided with an ignition head 115 of the igniter 110. The nozzle 116 of the ejector 105 delivers a fuel injection flow into the mixing tube 111. The fuel injection flow draws air and powder into the mixing tube 111 to form a mixed flow. The mixed flow is ignited in the combustion chamber 108 and then ejected from the injection port 114.

[0051] The cross-sectional area of ​​the combustion chamber 118 is larger than the cross-sectional area of ​​the inner cavity of the mixing tube 111, which can effectively enlarge the channel. A small part of the mixed airflow is diverted to the surrounding of the main jet channel to form a low-speed mixed airflow that is easy to be ignited by the spark of the igniter 110, and then ignite the entire mixed airflow.

[0052] In this example, a spoiler 109 is further provided within the combustion chamber 108. The function of the spoiler 109 is to disrupt the mixed gas to form a low-speed airflow that facilitates ignition within the combustion chamber. Various known structures capable of disrupting the airflow can be employed to create an irregular region of airflow density within the combustion chamber, thereby dissipating a small amount of the fluid's kinetic energy and reducing its flow velocity for easier ignition.

[0053] In the example, the spoiler 109 has an intermediate channel 117 that is concentrically arranged with the mixing tube 111. The connecting portion of the intermediate channel 117 and the mixing tube 111 is provided with a diversion gap 118, which guides a small portion of the mixed airflow into the combustion chamber 108 around the intermediate channel 117, the main jet channel. In the example, the intermediate channel 117 has the same diameter as the mixing tube 111, which ensures the turbulent ignition while facilitating the large-scale high-speed eruption of powder and flames. In the example, a number of axial grooves 119 are evenly distributed on the outer peripheral side wall of the intermediate channel 117 to regulate the flow direction of the diverted airflow and avoid powder retention. In the example, a ring body 120 is arranged on the outer periphery of the axial grooves 119 to block the airflow and facilitate ignition.

[0054] Example 3: See Figure 10 , which illustrates another specific structure of the ejector of the present invention. This differs from Example 1 in that the mixing tube 201 is connected to a tapered tube 202, which has an air inlet 203 centrally located within it. An annular gap 204 between the tapered tube 202 and the air inlet 203 forms the ejector nozzle. The pressurized fuel chamber is connected to the inner cavity of the tapered tube 202 via a conduit 207, and the fuel ejection flow is delivered into the mixing tube 201 through the nozzle formed by the annular gap 204.

[0055] The side wall of the mixing tube 201 is provided with a powder feed port 205, which is connected to a powder hopper 206. The negative pressure effect generated by the high-speed fuel jet is effectively utilized to transport the powder and mix it with the air and fuel jet sucked in by the air inlet 203 for ignition and eruption.

[0056] Example 4: See Figure 11, which illustrates another specific structure of the spoiler of the present invention. This differs from Example 2 in that the spoiler comprises a flared portion 303, connecting the intermediate passage 301 with the mixing tube 302. Diverter holes 304 are provided in the flared portion 303. A small portion of the mixed airflow is directed into the combustion chamber 305 surrounding the intermediate passage 301 via the flared portion 303 and its diverter holes 304. The ignition head 306 ignites the igniter and ejects the mixture from the nozzle at the top of the combustion chamber 305. This similarly ensures ignition of the turbulent flow while facilitating the high-speed emission of powder sparks and flames after the mixture ignites.

[0057] Example 5: See Figure 12 for another specific structure of the spoiler of the present invention. This differs from Example 2 in that the spoiler within the combustion chamber 403 includes a cap 406 that seals the end of the mixing tube 401. A main nozzle 404 is centrally located on the cap 406, and several diverter holes 405 are provided around the cap 406. A small portion of the mixed airflow is diverted through the diverter holes 405 into the combustion chamber 403 surrounding the main nozzle 404, where it is ignited by the ignition head 402 and ejected from the nozzle at the top of the combustion chamber 403. This also ensures ignition through the spoiler.

[0058] Example 6: See Figure 13 for another specific structure of the present invention. This differs from Example 2 in that the fuel storage container 501 is connected to the ejector nozzle 504 via a control valve 502 and a fuel pipeline 503. The fuel pipeline 503, located behind the control valve 502, passes through the combustion zone of the mixed gas—in this example, the combustion chamber 505. The high temperature of combustion preheats the fuel, increasing the degree of vaporization and the velocity of the fuel jet.

[0059] Example 7: See Figure 14 for another specific embodiment of the present invention. This differs from Example 1 in that the fuel storage container is connected to the ejector nozzle via a pressure-boosting and pressure-accumulating mechanism. This effectively controls and / or increases the velocity of the fuel jet. Furthermore, the fireworks device in this example is mounted on a rotating bracket and rotated by a driving member. This allows for the shaping of the fireworks that eject powder.

[0060] Specifically, the example includes a powder silo 601, a mixing tube 602, an electric screw feed mechanism 603, a rotating bracket 604, an electric igniter assembly 605, a solenoid valve assembly 606, a pressure storage device 607, a power module 608, a rotating motor 609, fuel silo A 610, a booster pump 611, a control module 612, fuel silo B 613, and fuel silo C 614. Fuel in each silo enters the ejector through the booster pump 611, the pressure storage device 607, and the hose 615, where it is ejected from the nozzle to form a fuel jet. The powder silo 601, mixing tube 602, ejector, and its associated components are mounted on the rotating bracket 604 and driven to rotate and oscillate by the rotating motor 609.

[0061] Example 8: This differs from Example 1 in that the powder hopper is connected to the powder inlet of the mixing tube via an electric or pneumatic dosing mechanism; the fuel storage device is equipped with a solenoid valve; and the pyrotechnic device is controlled by a remote control module, such as a wireless, Bluetooth, or remote control module, to effectively remotely control the pyrotechnic device.

[0062] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the contents of this specification. This specification selects and describes these embodiments in detail in conjunction with the accompanying drawings in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is only limited by the claims and their full scope and equivalents, and is not limited by the specific embodiments disclosed.

Claims

1. A pyrotechnic device based on powder combustion and eruption, characterized in that: It includes an ejector connected to a pressure fuel chamber, the ejector is connected to a mixing tube, the mixing tube is provided with inlets for air and powder, the mixing tube above the inlet is connected to an injection port, an igniter is provided between the inlet and the injection port, the nozzle of the ejector sends a fuel ejection flow into the mixing tube, the fuel ejection flow sucks air and powder into the mixing tube to form a mixed flow, and the mixed flow is ignited by the igniter and then ejected from the injection port; the powder inlet on the mixing tube is connected to a powder silo, and the powder silo is provided with a quantitative adjustment mechanism.

2. A pyrotechnic device based on powder combustion and eruption according to claim 1, characterized in that: The mixing tube above the inlet is connected to the combustion chamber, the cross-sectional area of ​​the combustion chamber is larger than the inner cavity of the mixing tube, the upper end of the combustion chamber is connected to the injection port, an igniter is provided in the combustion chamber, the nozzle of the ejector sends the fuel injection flow into the mixing tube, the fuel injection flow draws air and powder into the mixing tube to form a mixed flow, and the mixed flow is ejected from the injection port after being ignited in the combustion chamber.

3. A pyrotechnic device based on powder combustion and eruption according to claim 2, characterized in that: The combustion chamber is further provided with a spoiler, which disrupts the mixed gas to form a low-speed airflow that is convenient for ignition in the combustion chamber.

4. A pyrotechnic device based on powder combustion and eruption according to claim 3, characterized in that: The spoiler has a middle channel arranged concentrically with the mixing tube, and a diversion gap is provided at the connection portion between the middle channel and the mixing tube.

5. A pyrotechnic device based on powder combustion and eruption according to claim 4, characterized in that: A plurality of axial grooves are distributed on the outer peripheral side wall of the middle channel.

6. A pyrotechnic device based on powder combustion and eruption according to claim 4, characterized in that: A ring body is mounted on the outer periphery of the axial groove.

7. A pyrotechnic device based on powder combustion and eruption according to claim 3, characterized in that: The spoiler has an expansion pipe portion communicating with the intermediate channel and the mixing pipe, and a diversion hole is provided on the expansion pipe portion.

8. A pyrotechnic device based on powder combustion and eruption according to any one of claims 4 to 7, characterized in that: The middle channel has the same diameter as the mixing tube.

9. A pyrotechnic device based on powder combustion and eruption according to any one of claims 1 to 7, characterized in that: The nozzle of the ejector is arranged at the center of the mixing tube, and the side wall of the mixing tube is provided with an inlet for air and powder.

10. A pyrotechnic device based on powder combustion and eruption according to any one of claims 1 to 7, characterized in that: The mixing tube is connected to the tapered tube, an air inlet is centrally arranged in the tapered tube, an annular gap between the tapered tube and the air inlet constitutes the nozzle of the ejector, and a powder inlet is arranged on the side wall of the mixing tube.

11. A pyrotechnic device based on powder combustion and eruption according to any one of claims 1 to 7, characterized in that: The fuel storage container is connected to the ejector through a control valve and a fuel pipeline. The fuel pipeline at the rear end of the control valve is connected to the ejector after passing through the combustion zone of the mixed gas.

12. A pyrotechnic device based on powder combustion and eruption according to any one of claims 1 to 7, characterized in that: The fuel storage container is connected to the ejector through a pressure-boosting and pressure-accumulating mechanism.

Images