Firework device based on powder combustion eruption

Abstract

The firework device comprises an ejector connected with a pressure fuel containing cavity, the ejector is connected with a mixing pipe, the mixing pipe is provided with an air and powder inlet, the portion, above the inlet, of the mixing pipe is connected with an injection opening, and an igniter is arranged between the inlet and the injection opening. A nozzle of the ejector feeds fuel ejection flow into the mixing pipe, the fuel ejection flow sucks air and powder into the mixing pipe to form mixed airflow, and the mixed airflow is ejected out from the ejection opening after being ignited by the igniter. Firework eruption can be achieved without preheating powder, and the equipment structure is effectively simplified; meanwhile, the combination of sparks and flames can be presented, and the firework effect presented by fireworks is completely simulated.

Description

Technical Field

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

[0002] In the prior art, Chinese patent documents such as publication (announcement) numbers: CN105241316A, CN105258576A, CN105371707A, CN105854317A, and CN107121022A disclose a cold flame eruption device. It is intended to replace the traditional flame ejection consisting of gunpowder emission, eliminating the need for gunpowder and eliminating safety hazards. In this series of patent documents, the combustion heating outside the wall of the feed pipe is the key factor for powder excitation and ignition to achieve cold flame eruption. Other similar products of applicants, such as "a device for emitting and controlling colored cold fireworks - Publication (Announcement) No.: CN106767189A" adopts "heating coil heating"; "a heating element device and stage cold fireworks equipment - Publication (Announcement) No.: CN216482556U" adopts "a heating module is sheathed on the outer wall of the tube for conveying metal powder"; "a gunpowder-free environmentally friendly fireworks machine - Publication (Announcement) No.: CN109000519A" adopts "the outer surface of the conveying tube is also provided with a heating ring and a heat preservation ring from the inside to the outside". All of them adopt similar powder excitation and ignition means.

[0003] In order to solve the problems of high ineffective energy consumption and monotonous color of a single device in the above-mentioned device, Chinese patent document CN108827088A discloses "a powder combustion and spraying device imitating cold light and flame effect", which preheats and conveys the powder by mixing high-pressure and high-temperature air with the powder.

[0004] However, the above existing devices all have the following disadvantages: First, the existing devices need to preheat the powder to achieve the fireworks eruption, and many components are required to complete the eruption, resulting in a complex device structure. At the same time, the flow of powder between components requires the coordination of the structure and action of each component, so the working reliability is reduced. For example, the residual metal powder in the conveying channel is easily blocked by agglomeration after being damp. Second, the existing devices can only present the star effect of powder burning (referred to as sparks), while the spray fireworks can present a combination of sparks and flames (or flames), so the existing devices cannot completely simulate the fireworks effect presented by 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 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 an injection port, an igniter is provided between the inlet and the injection port, the nozzle of the ejector sends the fuel ejection flow into the mixing tube, the fuel ejection flow sucks 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 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.

[0007] In the above technical solution, the fuel is a combustible liquid or a combustible gas, etc. The powder includes fireworks metal powder (such as titanium, copper, potassium, aluminum, lithium, etc.) and fireworks raw material powders such as barium salt, strontium salt, sodium salt and copper salt, and also supports the heating, ignition and eruption of traditional fireworks ingredients. The components that increase temperature, promote combustion and generate gas can be removed from the traditional fireworks ingredients, making the fireworks safer.

[0008] In order to improve the reliability of igniting powder, in one embodiment, 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 injector sends the fuel injection flow into the mixing tube, the fuel injection flow sucks air and powder into the mixing tube to form a mixed flow, and the mixed flow is ejected from the injection port after the combustion chamber is ignited. The cross-sectional area of ​​the combustion chamber is larger than the inner cavity of the mixing tube, which can effectively increase the channel, and a small part of the mixed flow is diverted to the surroundings of the main jet channel to form a low-speed mixed flow that is easy to be ignited by the spark of the igniter, and then the entire mixed flow is ignited. Furthermore, a spoiler is also provided in the combustion chamber, and the spoiler disturbs the mixed gas to form a low-speed airflow that is easy to ignite in the combustion chamber.

[0009] In one embodiment, the spoiler has an intermediate channel arranged concentrically with the mixing tube, and a flow splitting gap is provided at the connection portion between the intermediate channel and the mixing tube. In a preferred embodiment, the intermediate channel has the same diameter as the mixing tube, and in a preferred embodiment, a plurality of axial grooves are distributed on the peripheral sidewall of the intermediate channel. Furthermore, a ring body is set on the periphery of the axial groove. While ensuring the ignition of the spoiler, it is beneficial to the large-scale high-speed eruption of powder and flame.

[0010] In another preferred embodiment, the spoiler has an expansion part connecting the intermediate channel and the mixing tube, and the expansion part is provided with a diversion hole, so as to ensure the ignition of the spoiler and facilitate the large-scale high-speed eruption of powder and flame.

[0011] In one embodiment, 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, so as to effectively utilize the negative pressure effect generated by the high-speed fuel ejection flow to realize powder transportation and mixing with air and fuel for ignition and eruption.

[0012] In one embodiment, the mixing tube is connected to a conical tube, an air inlet is centrally arranged in the conical tube, an annular gap between the conical tube and the air inlet constitutes a nozzle of the ejector, and a powder inlet is arranged on the side wall of the mixing tube. The negative pressure effect generated by the high-speed fuel ejection flow is effectively utilized to realize powder transportation and mixing with air and fuel for ignition and eruption.

[0013] In one embodiment, the fuel storage container is connected to the ejector through a control valve and a fuel pipeline, and the fuel pipeline at the rear end of the control valve passes through the combustion zone of the mixed gas and then connects to the ejector. The high temperature of combustion is used to preheat the fuel, increase the degree of gasification, and increase the speed of the fuel jet.

[0014] In one embodiment, the fuel storage container is connected to the ejector via a pressure boosting and pressure storage mechanism, so as to effectively control and / or increase the speed of the fuel jet.

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

[0016] In one embodiment, the powder silo is connected to the powder inlet on the mixing tube through an electric or pneumatic quantitative feeding mechanism; the fuel storage device is provided with a solenoid valve; the pyrotechnic device controls the electric quantitative feeding mechanism, the solenoid valve and the electric igniter through a remote control module. The remote control of the pyrotechnic device is effectively realized, and the remote control module is a control module such as a wireless, Bluetooth and remote control.

[0017] The beneficial effects of the present invention are: the Bernoulli principle is applied to a pyrotechnic device formed by powder combustion and eruption for the first time, the fuel is ejected at an ultra-high speed through the ejection device, and a lower pressure can be formed at the air inlet at a suitable position on the air flow channel of the eruption ignition tube, so as to "suck" more air and powder in, and fully mix with the fuel, react and burn violently, and the high temperature formed by the flame makes the gas expand more, the pressure increases, and the flame and the ignited powder are ejected at a higher speed at the same time, which can present a combination of sparks and flames (or flames), completely simulating the pyrotechnic effect presented by fireworks. The pyrotechnic eruption can be achieved without preheating the powder, and no additional wind source, heat source and power source are required, which effectively simplifies the equipment structure.

[0018] The powder silo can utilize 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 can be achieved.

[0019] In the eruption ignition tube, the fuel, air and powder are fully mixed, can be directly ignited and ejected at high speed, the temperature of the flame is between 280 and 1800℃, and can ignite most of the fireworks metal powders on the market (such as titanium, copper, potassium, aluminum, lithium, etc.) and fireworks raw material powders such as barium salts, strontium salts, sodium salts and copper salts. The powder is between 1 and 3000 meshes, and the corresponding mesh powder is selected according to the needs. The smaller the powder, the larger the surface area per unit volume, so that the powder is ignited between 300 and 1500℃. At the same time, it also supports the ignition and eruption of traditional fireworks ingredients; therefore, it can display cold light fireworks and fireworks effects with a variety of flame colors.

[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, strong magnetic field, etc., 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 make small eruption devices through miniaturization, such as handheld products.

[0024] The high-speed fuel jet forms a negative pressure zone above the nozzle, and the surrounding oxygen supply is insufficient. At this time, it is difficult to ignite the fuel fluid with a very high flow rate, effectively preventing the flashback phenomenon and effectively ensuring safety. In a preferred embodiment, a one-way valve can also be set on the fuel pipeline.

[0025] Therefore, the device of the present invention can display cold light fireworks and firework effects of various flame colors, has the advantages of rapid ignition, good uniformity of ejection speed, simple structure, safety and reliability, and the ejected fuel rises with the hot air during combustion, so that the burning powder is brought 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 of reference 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. When an element is referred to as "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 3 It is a schematic diagram of the partial principle structure of Example 2 (comparison between the combined state and the separated state);

[0031] Figure 4 Schematic diagram of the combined structure of the mixing tube, combustion chamber and spoiler of Example 2 Figure 1 ;

[0032] Figure 5 Schematic diagram of the combined structure of the mixing tube, combustion chamber and spoiler of Example 2 Figure 2 ;

[0033] Figure 6 The combined partial cross-sectional structure of the mixing tube, combustion chamber and spoiler of Example 2 is shown in FIG. Figure 1 ;

[0034] Figure 7 The combined partial cross-sectional structure of the mixing tube, combustion chamber and spoiler of Example 2 is shown in FIG. Figure 2 ;

[0035] Figure 8 Schematic diagram of the combined structure of the middle channel, axial groove and ring body of the spoiler of Example 2;

[0036] Fig. 9Schematic diagram of the combined structure of the axial groove and the ring body of the spoiler of Example 2;

[0037] Fig.10 This is a schematic diagram of the ejector structure of Example 3;

[0038] Fig.11 is a schematic diagram of the spoiler structure of Example 4;

[0039] Fig.12 is a schematic diagram of the spoiler structure of Example 5;

[0040] Fig.13 It is a structural schematic diagram of Example 6;

[0041] Fig.14 This is a schematic diagram of the structure of Example 7. DETAILED DESCRIPTION

[0042] Example 1: See attached Figure 1 , reflecting a specific structure of the present invention. The pyrotechnic device based on powder combustion and eruption comprises an ejector 5 connected to a pressure fuel chamber 6, the ejector 5 is 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 ejection flow 10 into the mixing tube 14, the fuel ejection 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 air flow 8, and the mixed air flow 8 is ignited by the igniter 9 and then ejected from the injection port 14.

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

[0044] The powder includes firework metal powder (such as titanium, copper, potassium, aluminum, lithium, etc.) and firework raw material powders such as barium salt, strontium salt, sodium salt and copper salt, and also supports the heating, ignition and eruption of traditional firework ingredients. The components that increase temperature, promote combustion and generate gas can be removed from traditional firework ingredients, making the setting off safer. In the example, the fireworks device includes a powder silo 1 that discharges the powder based on its own gravity, and the powder silo 1 is connected to the discharge port 3 on the mixing tube 14 through a quantitative adjustment switch 2.

[0045] In the example, the nozzle 15 of the ejector 5 is arranged at the bottom center of the mixing tube 14, and the side wall 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 used to realize powder transportation and mixing with air and fuel to ignite and erupt.

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

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

[0048] Example 2: See attached Figure 2-9 , reflecting another specific structure of the present invention.

[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. Housing; 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 powder, in the example, the mixing tube 111 above the feed port 103 is connected to the combustion chamber 108, and the combustion chamber 108 is made of ceramic material. The cross-sectional area of ​​the combustion chamber 108 is larger than the inner cavity of the mixing tube 111, and 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, and the nozzle 116 of the ejector 105 delivers the fuel injection flow into the mixing tube 111. The fuel injection flow sucks air and powder into the mixing tube 111 to form a mixed flow, and 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 increase the passage, and a small portion of the mixed airflow is directed to the periphery of the main jet passage, forming a low-speed mixed airflow that is easy to be ignited by the spark of the igniter 110, thereby igniting the entire mixed airflow.

[0052] In the example, a spoiler 109 is further provided in the combustion chamber 108. The function of the spoiler 109 is to disrupt the mixed gas to form a low-speed airflow that is easy to ignite in the combustion chamber. Various known structures that can achieve the function of disrupting the airflow can be used to form an irregular area of ​​airflow density in the combustion chamber, consume a small part of the fluid kinetic energy, and reduce its flow rate for easy 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 part 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 flame. 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, the outer peripheral ring body 120 of the axial groove 119 blocks the airflow to facilitate ignition.

[0054] Example 3: See attached Fig.10 , reflecting another specific structure of the ejector of the present invention. The difference from Example 1 is that the mixing tube 201 is connected to the tapered tube 202, an air inlet 203 is centrally arranged in the tapered tube 202, an annular gap 204 between the tapered tube 202 and the air inlet 203 constitutes the nozzle of the ejector, the pressure fuel chamber is connected to the inner cavity of the tapered tube 202 through the conduit 207, and the fuel ejection flow is sent 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 flow is effectively utilized to realize powder transportation and mixing with the air sucked in by the air inlet 203 and the fuel jet flow to ignite and erupt.

[0056] Example 4: See attached Fig.11 , reflecting another specific structure of the spoiler of the present invention. The difference from Example 2 is that the spoiler has a pipe expansion part 303, the pipe expansion part 303 connects the middle channel 301 and the mixing tube 302, and a diverter hole 304 is provided on the pipe expansion part 303. A small part of the mixed airflow is guided into the combustion chamber 305 around the middle channel 301 through the pipe expansion part 303 and its diverter hole 304, ignited by the ignition head 306, and ejected from the injection port at the upper end of the combustion chamber 305. The purpose of ensuring the ignition of the spoiler can also be achieved, and at the same time, it is conducive to the large-scale high-speed eruption of powder sparks and flames after the mixed air is ignited.

[0057] Example 5: See attached Fig.12, reflecting another specific structure of the spoiler of the present invention. The difference from Example 2 is that the spoiler in the combustion chamber 403 has a cap body 406 that covers the port of the mixing tube 401, and a main nozzle 404 is centrally arranged on the cap body 406, and a plurality of diverter holes 405 are arranged on the cap body around the main nozzle 404. A small part of the mixed airflow is guided into the combustion chamber 403 around the main nozzle 404 through the diverter holes 405, ignited by the ignition head 402, and ejected from the injection port at the upper end of the combustion chamber 403. The purpose of ensuring spoiler ignition can also be achieved.

[0058] Example 6: See attached Fig.13 , reflecting another specific structure of the present invention. The difference from Example 2 is that the fuel storage container 501 is connected to the nozzle 504 of the ejector through the control valve 502 and the fuel pipeline 503, and the fuel pipeline 503 at the rear end of the control valve 502 bypasses the combustion zone of the mixed gas, which is the combustion chamber 505 in the example. The high temperature of combustion is used to preheat the fuel, increase the degree of gasification, and increase the speed of the fuel jet.

[0059] Example 7: See attached Fig.14 , reflecting another specific structure of the present invention. The difference from Example 1 is that the fuel storage container is connected to the nozzle of the ejector through a pressure-increasing and pressure-storing mechanism. The speed of the fuel jet is effectively controlled and / or increased. At the same time, the fireworks device in the example is installed on a rotating bracket and driven to rotate by a driving member. The fireworks that eject powder are shaped.

[0060] Specifically, the example includes a powder silo 601, a mixing tube 602, an electric screw feeding 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, a fuel silo A 610, a booster pump 611, a control module 612, a fuel silo B 613, and a fuel silo C 614. The fuel in each fuel silo enters the ejector through the booster pump 611, the pressure storage device 607, and the hose 615, and then is ejected from the nozzle to form a fuel jet. The powder silo 601, the mixing tube 602, the ejector and its auxiliary components are installed on the rotating bracket 604, and are driven to rotate and swing by the rotating motor 609.

[0061] Embodiment 8: The difference from Embodiment 1 is that the powder silo is connected to the powder inlet on the mixing tube through an electric or pneumatic quantitative feeding mechanism; the fuel storage device is provided with a solenoid valve; the pyrotechnic device controls the electric quantitative feeding mechanism, the solenoid valve and the electric igniter through a remote control module. The remote control of the pyrotechnic device is effectively realized, and the remote control module is a control module such as a wireless, Bluetooth and remote control.

[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 implementation methods described. Obviously, many modifications and changes can be made according to the content 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 use 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 as claimed in 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 arranged in the combustion chamber, the nozzle of the ejector sends the fuel injection flow into the mixing tube, the fuel injection flow sucks 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 as claimed in claim 2, characterized in that: The combustion chamber is also provided with a spoiler, which disturbs the mixed gas to form a low-speed airflow that is easy to ignite in the combustion chamber.

4. A pyrotechnic device based on powder combustion and eruption as claimed in claim 3, characterized in that: The spoiler has an intermediate channel which is arranged concentrically with the mixing tube, and a flow splitting gap is arranged at a connection portion between the intermediate channel and the mixing tube.

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

6. A pyrotechnic device based on powder combustion and eruption as claimed in 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 as claimed in claim 3, characterized in that: The spoiler has a pipe expansion portion communicating with the intermediate channel and the mixing tube, and a flow diversion hole is arranged on the pipe expansion portion.

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

9. A pyrotechnic device based on powder combustion and eruption as claimed in 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 inlets 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 conical tube, an air inlet is arranged in the center of the conical tube, an annular gap between the conical 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, and 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 as claimed in any one of claims 1 to 7, characterized in that: The fuel storage container is connected to the ejector via a pressure-boosting and pressure-accumulating mechanism.

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