Cold spark fireworks effect generation apparatus using contact-ignitable combustible powder

Abstract

Disclosed in the present invention is a cold spark fireworks effect generation apparatus using contact-ignitable combustible powder, comprising a powder passage provided with an ejection port. Heating elements are distributed in the powder passage, and the heating elements are resistive heating elements. The apparatus further comprises a powder storage apparatus for feeding combustible powder into the powder passage, and a blower assembly for introducing an airflow into the powder passage. When passing through the powder passage, combustible powder carried by the airflow contacts the heating elements to be ignited, and is ejected from the ejection port. The ignition of the combustible powder by direct contact with the heating elements not only reduces heat transfer steps and effectively reduces energy consumption, but also omits necessary ignition components in the prior art; and preheating, a plasma generator, a pressurized fuel component, and the like are not required, so that the apparatus has a simple structure, thereby facilitating product miniaturization.

Description

A device for generating cold light fireworks effects from combustible powder that can be ignited by contact Technical Field

[0001] This invention relates to a device for generating a cold light fireworks effect using combustible powder. Background Technology

[0002] Traditional cold light fireworks (cold fireworks) use gunpowder combustion to ignite combustible powders such as metals or metal oxides mixed in, creating a star-like effect.

[0003] In existing technologies, to replace traditional gunpowder-based pyrotechnic ejection and eliminate the safety hazards associated with gunpowder, many devices simulating the effects of cold-light fireworks have been developed. These devices use combustible powder ignition and ejection to create the effect of cold-light fireworks, and are widely used due to their high safety. To achieve the ignition and activation of combustible powder, existing technologies can be summarized as follows:

[0004] I. Powder Preheating + Ignition Mode: As disclosed in Chinese patent documents such as CN105241316A, CN105258576A, CN105371707A, CN105854317A, and CN107121022A, this is a cold flame emission device. In this series of patent documents, heating the outside of the feeding pipe wall is the key factor for powder activation and ignition, thereby achieving cold flame emission. Other similar patent documents, such as "A Colored Cold Fireworks Ejection and Control Device - Publication No.: CN106767189A," use "heating spiral tube heating"; "A Heating Element Device and Stage Cold Fireworks Equipment - Publication No.: CN216482556U" uses "a heating module sleeved on the outer wall of the tube for conveying metal powder"; and "A Powder-Free Environmentally Friendly Fireworks Machine - Publication No.: CN109000519A" states that "the outer surface of the conveying pipe is also provided with a heating ring and an insulation ring from the inside out." All of these use similar powder activation and ignition methods.

[0005] II. Ignition based on arc excitation from a plasma generator. For example, the "Multi-flame Powder Combustion Ejection Device" disclosed in publication number CN119687731A.

[0006] III. Ignition of pressure fuel jet combustion based on Bernoulli's principle. For example, CN 221945035U (authorization announcement number) discloses a handheld pyrotechnic device based on powder combustion ejection; CN 222068500U (authorization announcement number) discloses a pyrotechnic device based on powder combustion ejection.

[0007] The drawback of existing technologies is that in order to ignite and excite metal or metal oxide powder to produce the star effect of cold light fireworks, a high heating temperature is required, which leads to a series of problems: such as high energy consumption of the device, especially high ineffective energy consumption; or a large number of necessary components such as igniter, plasma generator, and pressure fuel assembly, making the structure relatively complex and difficult to miniaturize; or high energy and flammability make safety lacking. Summary of the Invention

[0008] To address the aforementioned drawbacks, the technical problem to be solved by this invention is to provide a device that utilizes combustible powder to generate a cold light fireworks effect, which can effectively reduce the energy consumption used to ignite the combustible powder and has a simple structure.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is a device for generating cold light fireworks effects from combustible powder through contact ignition, comprising:

[0010] A powder channel with a nozzle is provided, and heating elements are distributed in the powder channel, wherein the heating elements are electric heating elements;

[0011] A powder storage device that feeds combustible powder into a powder channel;

[0012] A pneumatic component that introduces airflow into the powder channel;

[0013] Combustible powder carried by the airflow is ignited upon contact with the heating element as it passes through the powder channel and is ejected from the nozzle.

[0014] The beneficial effects of this invention are as follows: While existing technologies such as arc ignition and pressurized fuel jet combustion ignition involve direct flame ignition of the powder, their structures are complex. In the powder preheating + ignition mode, the combustible powder does not directly contact the heating element, resulting in high energy consumption in the heat transfer process, and an igniter is also required. In the technical solution of this invention, the combustible powder directly contacts the heating element and is ignited, which not only saves the heat transfer process and effectively reduces energy consumption, but also eliminates the necessary ignition components in existing technologies. The elimination of preheating, plasma generators, pressurized fuel components, etc., makes the device structure relatively simple and also facilitates product miniaturization.

[0015] Preferably, the heating element is a resistance heating element.

[0016] Preferably, the heating element is an electrically heated resistive element, which is distributed in a grid pattern on the cross-section of the powder channel.

[0017] Preferably, the heating element is composed of several arc-shaped guide plates disposed in the powder channel, and the guide plates are electrically heated resistance plates.

[0018] Preferably, the heating element is a channel with a curved portion, and the channel is a resistive element that is heated by electricity.

[0019] Preferably, the heating element is composed of several grid bodies with curved portions, and the grid bodies are resistive elements that are heated by electricity.

[0020] Preferably, the heating element is composed of several linear bodies distributed back and forth along the axial direction of the powder channel, and the linear bodies are staggered in the circumferential direction of the cross-section of the powder channel.

[0021] Preferably, several stages of heating elements are arranged along the front and back of the powder channel.

[0022] Preferably, the powder storage device uses a gravity feeding mechanism or a screw feeding mechanism to feed combustible powder into the powder channel.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all the advantages of the preferred solutions described above at the same time.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the overall structure of Example 1.

[0031] Figure 2 is a top view of the heating element structure of Example 1.

[0032] Figure 3 is a top view of the heating element with other grid-like structures.

[0033] Figure 4 is a schematic diagram of the overall structure of Example 2.

[0034] Figure 5 is a schematic diagram of the overall structure of Example 3.

[0035] Figure 6 is a schematic diagram of the overall structure of Example 4.

[0036] Figure 7 is a three-dimensional structural diagram of the heating element in Example 4.

[0037] Figures 8-10 are schematic diagrams of the gun-shaped outer shell of Example 5.

[0038] Figure 11 is a schematic diagram of the overall structure of Example 6.

[0039] Figures 12-15 are schematic diagrams of structures with different numbers of current-conducting resistors.

[0040] Figures 16-18 are schematic diagrams of the structure of Example 7.

[0041] Figure 19 is a schematic diagram of a heating element structure with a spiral pipe.

[0042] Figure 20 is a schematic diagram of a heating element structure with a curved section in the pipe. Detailed Implementation

[0043] Example 1: Referring to Figures 1-3, a specific structure of the present invention is illustrated. The contact-ignited combustible powder cold light fireworks effect generating device includes a powder channel 6 with an ejection port 9, and heating elements 8 distributed in the powder channel 6. The heating elements 8 are electric. Heating element. In this example, the heating element 8 is powered by a power supply assembly 4. The power supply assembly 4 can be a battery or an external power source. A thermal insulation layer 7 is provided in the area where the heating element 8 is installed. This layer provides both thermal insulation and heat insulation, facilitating installation on a fixed structure and helping to maintain a constant temperature for the heating element 8. In this example, the heating element 8 is an electrically heated resistance wire 801, which is distributed in a grid pattern across the cross-section of the powder channel 6. Gaps 802 are provided between the resistance wires 801 to allow combustible powder to pass through. In other embodiments, the resistance wires 801 can also adopt other grid-like distribution methods, as shown in Figure 3.

[0044] The device also includes a powder storage device 2 for feeding combustible powder into the powder channel 6. In this example, the powder storage device 2 uses a gravity feeding mechanism to feed combustible powder into the powder channel 6. As shown in Figure 1, the powder storage device 2, located at a higher position, is connected to the powder channel 6 via a feeding pipe, and the powder falls into the powder channel 6 by its own weight. The powder storage device 2 is equipped with a feeding switch 3.

[0045] The device also includes a wind turbine assembly 5 that supplies airflow into the powder channel 6. The wind turbine assembly 5 is equipped with an airflow regulating mechanism to adjust the size or rate of the incoming airflow. The airflow provided by the wind turbine assembly 5 carries the combustible powder from the powder storage device 2 through the powder channel 6, where it contacts the heating element 8, is ignited, and ejected from the nozzle 9. This creates a cold-light fireworks effect, producing a large number of star-like particles from the burning combustible powder. The wind turbine assembly 5 can be powered by a power supply assembly 4.

[0046] It seems difficult to reliably achieve stable and continuous combustion simply by relying on the contact and collision between combustible powder and the heating element.

[0047] However, our experiments revealed that when the combustible powder carried by the airflow collides with the heating element 8, heat is transferred from the heating element 8 to the powder particles, causing their temperature to rise rapidly, reaching or even exceeding their ignition point. The airflow provided by the wind turbine component 5 plays a crucial role in the ignition process. The airflow provides oxygen, and its kinetic energy acts on the powder particles, increasing the collision frequency between particles, which facilitates heat transfer and reaction. The collision between the powder particles and the heating element also significantly increases the coefficient of friction and normal pressure, leading to the generation of localized high-temperature frictional heat, which also aids in powder ignition. This means that the heating element only needs to provide a relatively low heating temperature to reliably ignite the combustible particles under the synergistic effect of localized high-temperature frictional heat, thus reducing energy consumption. Once a localized powder is ignited, the combustion reaction continues within a certain range because the heat generated during particle combustion further heats the surrounding powder particles, causing them to also reach their ignition point and participate in combustion. This chain reaction allows the combustible powder to continue burning under the influence of the heating element and the airflow. Setting an appropriate distribution density of the mesh-like resistance wire 801 ensures that multiple localized powder particles are ignited, thus guaranteeing that the entire combustible powder stream carried by the airflow is fully ignited. To avoid powder waste and ensure the quantity and density (ignition intensity) of the ejected combustible particles, the heating element 8 distributed in the powder channel 6 appears to impede the flow of combustible powder. However, experiments have shown that under the stable and continuous airflow supply of the wind power component 5, most of the combustible powder carried by the airflow can overcome the obstruction of the heating element 8 and smoothly pass through the gap 802, thus forming a stable ejection (ejection intensity) through the powder channel 6.

[0048] As can be seen from the above, this device can directly heat and ignite combustible powder without the need for additional ignition components. The elimination of the need for preheating, plasma generators, pressure fuel assemblies, etc., makes the device structure relatively simple, thus enabling the entire device to be miniaturized.

[0049] To balance the requirements of ignition intensity and ejection intensity, thereby achieving a better cold-light fireworks effect, the device's adjustment method includes two aspects: first, adjusting the distribution density of the heating element's orthographic projection on the cross-section of the powder channel; second, adjusting the airflow of the wind power component. Current experimental results indicate that a distribution density of the heating element's orthographic projection on the cross-section of the powder channel between 50% and 100% is optimal, such as 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc. A higher distribution density can be achieved by arranging multiple stages of heating elements 8 along the front and rear of the powder channel 6 to maintain powder permeability.

[0050] Regarding combustible powders, the ignition points of metal particles are as follows: Titanium powder with a mesh size of 1-100 mesh has an ignition temperature of approximately 400-700℃, and titanium powder with a mesh size of 120-400 mesh has an ignition temperature of approximately 250-500℃; iron powder with a mesh size of 40-100 mesh has an ignition temperature of approximately 600-1000℃, iron powder with a mesh size of 120-400 mesh has an ignition temperature of approximately 400-700℃, iron powder with a mesh size of 500-1000 mesh has an ignition temperature of approximately 280-500℃, and nano-iron powder has an ignition temperature of approximately 250-280℃. The ignition point is directly proportional to the particle size. The heating element 8 using resistance heating can provide a heating temperature of 1000℃ within 2-5 seconds. The particle size of the combustible powder can be selected as needed. This ensures that the particle size, heating temperature, and airflow are matched to guarantee that the combustible powder is successfully ignited at the appropriate time (e.g., near the nozzle 9).

[0051] Example 2: Referring to Figure 4, a specific structure of the present invention is illustrated. The difference from Example 1 is that the powder storage device 2 feeds combustible powder into the powder channel 6 via a screw conveyor mechanism 10. The screw conveyor mechanism 10 is connected to the discharge port of the powder storage device 2. A motor 11 powered by the power supply assembly 4 is connected to the screw of the screw conveyor mechanism 10; turning on the motor 11 conveys the combustible powder from the powder storage device 2 into the powder channel 6.

[0052] Example 3: Referring to Figure 5, a specific structure of the present invention is shown. The difference from Example 1 is that three stages of heating elements 8 are arranged before and after the powder channel 6.

[0053] Example 4: Referring to Figures 6 and 7, a specific structure of the present invention is illustrated. The difference from Example 1 is that the heating element 8 is composed of several grid bodies with curved portions, as shown in Figure 7. The grid bodies are electrically heated resistive elements, and the combustible powder passes through the gaps between the grid bodies. To ensure sufficient contact between the grid bodies and the combustible powder, the grid bodies in this example are configured as a curved multi-layered structure. The combustible powder can be easily passed through by airflow, or it can pass through in a sequential queue according to the multi-layered arrangement.

[0054] Other embodiments may also use structures that increase the probability of contact, such as a spiral structure. As shown in Figures 19 and 20, the heating element is a pipe with a curved section, a twisted section, or a spiral section, and the pipe is a resistive element that is heated by electricity.

[0055] Example 5: Referring to Figures 8-10, another specific structure of the present invention is illustrated. It also includes a housing 1, a powder storage device 2, a power supply assembly 4, a fan assembly 5, a powder channel 6, a thermal insulation layer 7, an ejector nozzle 9, a spiral conveyor mechanism 10, and its motor 11. The heating element 8, composed of three grid-like structures, is distributed along the powder channel 6. In this example, the housing 1 is a gun-shaped shell, and the trigger 12 of the gun serves as the power switch for the heating element 8, the fan assembly 5, and the motor 11. Figure 9 shows four heating elements 8, which are electrically heated resistance wires. Figure 10 illustrates other structural examples of the same gun-shaped shell.

[0056] Example 6: Referring to Figures 11-15, a specific structure of the present invention is illustrated. The difference from Example 1 is that, in this example, the heating element 8 consists of three arc-shaped guide vanes disposed within the powder channel 6, and the guide vanes are electrically heated resistance plates. In other embodiments, the number of guide vanes can also be one (as shown in Figure 12), two (as shown in Figure 13), four (as shown in Figure 14), or multiple (as shown in Figure 15).

[0057] Example 7: Referring to Figures 16-18, another specific structure of the present invention is illustrated. The difference from the above embodiments is that, in this example, the heating element 8 is composed of several linear bodies 803 distributed back-and-forth along the axial direction of the powder channel 6. The linear bodies are electrically heated resistive bodies. The linear bodies 803 are staggered in the circumferential direction of the cross-section of the powder channel 6, and gaps 802 are provided between the linear bodies 803 to allow combustible powder to pass through. Figure 17 illustrates different staggered angles of the linear bodies 803 in the circumferential direction of the cross-section of the powder channel 6. Their density can be adjusted according to the particle size of the combustible powder, the heating temperature, the wind force, and other actual conditions. The same applies to heating elements with other structures. Figure 17 also illustrates different widths of the linear bodies 803.

[0058] The embodiments of the present invention disclosed above are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and describes these embodiments in conjunction with the accompanying drawings to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. However, the invention can be implemented in many ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the invention. Therefore, the invention is limited only by the claims and their full scope and equivalents, and not by the specific embodiments disclosed.

Claims

1. A device for generating cold light fireworks effects from combustible powder through contact ignition, characterized in that, The device includes: A powder channel with a nozzle is provided, and heating elements are distributed in the powder channel, wherein the heating elements are electric heating elements; A powder storage device that feeds combustible powder into a powder channel; A pneumatic component that introduces airflow into the powder channel; Combustible powder carried by the airflow is ignited upon contact with the heating element as it passes through the powder channel and is ejected from the nozzle.

2. The device for generating a cold light firework effect from combustible powder by contact ignition as described in claim 1, characterized in that, The heating element is a resistance heating element.

3. The device for generating a contact-ignited combustible powder cold light fireworks effect as described in claim 1, characterized in that, The heating element is an electrically heated resistive element, which is distributed in a grid pattern on the cross-section of the powder channel.

4. The device for generating a contact-ignited combustible powder cold light fireworks effect as described in claim 1, characterized in that, The heating element consists of several arc-shaped guide plates disposed in the powder channel, and the guide plates are electrically heated resistance plates.

5. The device for generating a contact-ignited combustible powder cold light fireworks effect as described in claim 1, characterized in that, The heating element is a channel with a curved portion, and the channel is a resistive element that is heated by electricity.

6. The device for generating a contact-ignited combustible powder cold light fireworks effect as described in claim 1, characterized in that, The heating element is composed of several grid bodies with curved sections, and the grid bodies are resistive elements that are heated by electricity.

7. The device for generating a cold light firework effect from combustible powder by contact ignition as described in claim 1, characterized in that, The heating element consists of several linear bodies distributed back and forth along the axial direction of the powder channel, with each linear body staggered in the circumferential direction of the cross-section of the powder channel.

8. A device for generating a contact-ignited combustible powder cold light fireworks effect as described in any one of claims 1-7, characterized in that, Several stages of heating elements are arranged along the front and back of the powder channel.

9. A device for generating a contact-ignited combustible powder cold light fireworks effect as described in any one of claims 1-7, characterized in that, The powder storage device uses a gravity feeding mechanism or a screw feeding mechanism to feed combustible powder into the powder channel.

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