Acoustic resonance-based high-safety mixing and flowing integrated device for high-solid-content energetic material

Abstract

The invention discloses a high-solid-content energetic material mixing and flowing integrated device based on acoustic resonance. The device comprises a static mixing pipe, a peristaltic pump unit integrated with an acoustic resonance device and a high-shear homogenizer. The static mixing pipe realizes material premixing and fluidity improvement through a multi-stage spiral blade and a turbulent flow baffle plate; the peristaltic pump unit adopts a high-pressure corrosion-resistant elastic hose, continuous low-shear flow is formed through roller extrusion, an acoustic resonance device of the peristaltic pump unit generates 20-50kHz high-frequency sound wave, and the material viscosity is remarkably reduced and particle aggregation is dispersed by utilizing an acoustic cavitation effect; and the high-shear homogenizer realizes deep refining mixing through rotor-stator strong shearing. The whole device adopts a sealed explosion-proof structure, and monitors the pressure (less than or equal to 0.4 MPa), the temperature (10-30 DEG C) and the oxygen content (less than or equal to 1.5%) in real time, and a shutdown and pressure relief emergency mechanism. The problems of blockage risk, non-uniform mixing (the uniformity is greater than or equal to 98%) and safety bottleneck of the energetic material with the solid content of 80-90% are solved in a breakthrough manner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energetic material mixing flow, in particular to a high-safety mixing flow integrated device for high solid content energetic materials based on acoustic resonance. BACKGROUND

[0002] High solid content energetic materials play a key role in the field of national defense, mining and other fields. The solid content of such materials is usually as high as 80%-90%, which presents high viscosity and a large number of particles, making the flowability poor and prone to blockage during transportation, which seriously restricts production efficiency. Moreover, energetic materials are extremely sensitive to mechanical action, static electricity and temperature changes, and once mishandled during transportation and mixing, it may cause catastrophic accidents such as combustion and explosion.

[0003] At present, traditional transportation and mixing equipment, such as ordinary centrifugal pumps combined with mixers, has many drawbacks when handling high solid content energetic materials. The centrifugal pump produces a large shear force during transportation, which easily damages the structure of the energetic materials and affects their performance; the mixer is difficult to achieve uniform mixing, and the mechanical friction and local overheating generated by high-speed stirring greatly increase the safety risk. In addition, these devices have low precision in flow control and mixing effect adjustment, which cannot meet the strict requirements of energetic materials in different production processes. SUMMARY

[0004] The present application proposes a high-safety mixing flow integrated device for high solid content energetic materials based on acoustic resonance, aiming to solve the problems of high blockage risk, poor safety, uneven mixing and inaccurate flow control of high solid content and high-risk energetic materials in the process of transportation and mixing in the prior art.

[0005] The technical solution of the application is: a high-safety mixing and flow integrated device for high solid content energetic materials based on acoustic resonance, mainly composed of a static mixing pipe, a peristaltic pump unit, a high shear homogenizer, a control system and a sealed explosion-proof device. Each peristaltic pump unit contains a driver, a pump head and a specially designed high-pressure, corrosion-resistant and wear-resistant elastic hose. The high shear homogenizer is made of special material and has a high-speed rotating rotor and stator inside. Through strong shearing, collision, cavitation and other effects, the high-efficiency refinement and mixing of energetic materials are realized. The discharge port of the static mixing pipe is connected to the feeding end of the peristaltic pump unit, and the discharge port of the peristaltic pump unit is connected to the feeding end of the high shear homogenizer, forming an integrated conveying and mixing system of "feeding → static mixing pipe → peristaltic pump → high shear homogenizer → discharge". The acoustic resonance device is installed at the roller of the peristaltic pump head, including a sound wave generator, a resonance cavity and a transmission component, which can generate 20-50 kHz high-frequency sound waves. The energy is enhanced by the resonance cavity and then transmitted to the energetic materials in the elastic hose. The acoustic cavitation effect is used to reduce the material viscosity, reduce particle agglomeration and improve flowability.

[0006] Working principle: after the system is started, the energetic materials enter the static mixing pipe from the feeding port. The static mixing pipe has a unique multi-stage mixing element structure, including left-handed and right-handed helical blades arranged alternately, and specific angle distribution of spoiler baffles. When the energetic materials flow through the static mixing pipe, they are repeatedly cut, twisted and collided by these mixing elements, realizing preliminary mixing and flow guiding, so that the materials reach a certain uniformity and have better flowability before entering the peristaltic pump unit. Then, the intelligent control system accurately drives the driver of the peristaltic pump unit according to the preset parameters and the characteristics of the energetic materials. The driver drives the roller of the pump head to rotate stably, and the roller successively extrudes the elastic hose to form a continuous "pillow" fluid space in the hose, pushing the energetic materials to move forward smoothly. In this process, the acoustic resonance device intelligently adjusts the sound wave parameters according to real-time monitoring data to dynamically optimize the energetic materials. After the energetic materials conveyed by the peristaltic pump unit enter the high shear homogenizer, they are subjected to strong shearing, collision, cavitation and other effects between the high-speed rotating rotor and stator, realizing deep refinement and uniform mixing of the materials. The preliminary treatment of the static mixing pipe, the efficient conveying of the peristaltic pump unit, the dynamic optimization of the acoustic resonance device and the strong shearing mixing of the high shear homogenizer jointly ensure the stable conveying flow and excellent mixing uniformity of the energetic materials. The double-sealed explosion-proof device builds a double safety protection barrier, strictly limits the entire conveying and mixing process in a safe and closed space, and prevents the leakage of energetic materials and the invasion of external dangerous factors.

[0007] Compared with the prior art, the application has the following advantages:

[0008] (1) The innovative structure of a combination of peristaltic pumps and static mixing tubes, high-shear homogenizers can effectively overcome the resistance of high-solid content energetic material transportation, avoid blockage, and at the same time, the damage to the material is small; static mixing tube does not need mechanical stirring, reduces friction and heat generation, improves the safety and uniformity of mixing, and the two work together, greatly improving the overall transportation and mixing performance. High-shear homogenizer through strong shear mixing, without mechanical stirring, reduces friction and heat generation, improves the safety and uniformity of mixing, and the two work together, greatly improving the overall transportation and mixing performance.

[0009] (2) The acoustic resonance device reduces the viscosity of the material through high-frequency sound waves, further reduces the transportation resistance, and improves the transportation efficiency by more than 30%, while assisting in dispersing particles, making the mixing uniformity improve to 98%

[0010] (3) The sealing and explosion-proof device adopts multi-layer sealing structure and explosion-proof design, such as using special sealing rubber ring and explosion-proof shell, to ensure that the energetic material is transported and mixed in a fully enclosed environment. At the same time, a comprehensive safety monitoring system is equipped to monitor parameters such as pressure, temperature, flow, oxygen content, etc. in real time. Once an abnormality occurs, the control system quickly starts the emergency response, such as cutting off the power supply, starting the explosion-proof pressure relief device, etc., to ensure the safety of the production process.

[0011] (4) The control system can accurately adjust the speed and running time of each peristaltic pump unit according to the characteristics of different energetic materials and production process requirements, so as to accurately control the transportation flow. And through the optimization of the structural parameters of the static mixing tube (such as the form, number, spacing of the mixing elements, etc.), combined with the transportation flow adjustment of the peristaltic pump, the mixing effect can be accurately controlled to meet various complex production needs.

[0012] Patent drawing

[0013] Figure 1 A high-safety mixing and flow integrated device for high-solid content energetic materials is shown in the schematic diagram;

[0014] Figure 2 A schematic diagram of the acoustic resonance device is shown;

[0015] Figure 3 A schematic diagram of the high-shear homogenizer device is shown; DETAILED DESCRIPTION

[0016] The following describes in detail a high-safety mixing and flow integrated device for high-solid content energetic materials based on acoustic resonance in combination with the drawings and specific implementation scenarios, so as to clearly understand the operation and implementation of the technical solution of the present application in practical application.

[0017] As shown in the figure, the device of the embodiment mainly consists of 1. pump shell, 2. driver, 3. pump head, 4. elastic hose, 5. sealing flange, 6. mixing blade, 7. connecting rod, 8. shell, 9. feeding port, 10. acoustic resonance device, 11. roller, 12. high shear homogenizer, and 13. discharge port. The working process is as follows: in the implementation process, the energetic material enters from the 9 feeding port into the static mixing pipe, and through the repeated cutting, twisting and collision of the mixing elements in the static mixing pipe, the preliminary mixing and flow guiding are realized, so that the material reaches a certain uniformity and has better fluidity before entering the peristaltic pump unit. In the peristaltic pump unit, the 2 driver drives the 11 rollers of the 3 pump head to rotate through the 7 connecting rod, and the 11 rollers successively extrude the 4 elastic hose, and the elastic deformation of the hose forms a "pillow" shaped fluid space, which pushes the energetic material forward to the 5 sealing flange. In this process, the 10 acoustic resonance device installed beside the 11 roller is started synchronously, and the high-frequency sound wave acts on the energetic material in the 4 elastic hose, and the acoustic cavitation effect is used to reduce the material viscosity, reduce the particle agglomeration and the adhesion of the inner wall of the hose. The energetic material delivered by the peristaltic pump unit enters the high shear homogenizer 12, and under the strong action between the high-speed rotating rotor and stator in the high shear homogenizer 12, the material is fully mixed, and finally discharged from the 13 discharge port. During the whole process, the sealing and explosion-proof device (integrated in the pump shell 1 and the shell 8 of the high shear homogenizer 12) ensures that the system is in a fully closed and safe state to prevent leakage of the energetic material.

[0018] Take the mixing and delivery of a certain high solid content rocket propellant (solid content 88%, particle size 0.05-1.5mm) and additives as an example:

[0019] I. Equipment selection and parameter setting

[0020] 1. Peristaltic pump unit: a peristaltic pump with a pump pipe inner diameter of 10mm is selected, the single pump speed range is 0-120rpm, the maximum flow is 2L / min, 5 peristaltic pump units are equipped for each delivery system to enhance the delivery capacity of high solid content energetic materials.

[0021] 2. Static mixing pipe: a special material mixing pipe with an inner diameter of 12mm is used, the pipe length is 1.5m, and spiral mixing elements are installed inside, the element spacing is 10cm, which ensures the full mixing of the energetic material.

[0022] 3. Initial parameter setting: according to the characteristics of the energetic material and the delivery requirements, the initial speed of the single peristaltic pump is set to 50rpm, at this time the single pump flow is about 0.8L / min, and the overall flow of the system is about 4L / min, which meets the basic delivery and mixing requirements of the production process.

[0023] II. Safety settings

[0024] 1. Safety threshold setting: The oxygen content inside the system is monitored in real time by a gas sensor and controlled below 1.5%; the upper limit of the pressure inside the pipeline is set at 0.4MPa, and the temperature monitoring range is 10℃-30℃ to prevent dangerous reactions of energetic materials caused by abnormal pressure and temperature.

[0025] 2. Explosion-proof measures: All electrical components in the device are explosion-proof, and static electricity discharge devices and spark suppression devices are installed to promptly discharge static electricity, suppress spark generation, and prevent the explosion of energetic materials.

[0026] III. Operation Monitoring

[0027] 1. Data Acquisition: The flow rate, pressure, and temperature data of each peristaltic pump unit are collected every 8 seconds, as well as the pressure, temperature, and mixing uniformity data in the static mixing tube, so as to monitor the operating status of the device in real time.

[0028] 2. Automatic adjustment mechanism: When the flow deviation of a certain peristaltic pump unit exceeds ±2.5%, the control system automatically analyzes and adjusts the speed of the pump and adjacent pumps for compensation, with a compensation accuracy of ±0.3 rpm; if the mixing uniformity in the static mixing tube does not meet the standard, the system automatically adjusts the peristaltic pump delivery rhythm to ensure the stability of energetic material delivery and mixing.

[0029] 3. Emergency handling: If the pipeline pressure reaches 0.38MPa, the system will immediately issue an audible and visual alarm and reduce the speed of all peristaltic pumps by 20rpm; if the pressure continues to rise to 0.4MPa, all peristaltic pumps will be stopped instantly, and the fast explosion-proof pressure relief valve will be activated to reduce the pipeline pressure to a safe range within 3 seconds.

[0030] IV. Conveying and Mixing Effect Testing

[0031] 1. Conveying efficiency detection: A high-precision flow monitoring device is installed at the outlet of the device. The ratio of the actual conveying volume to the theoretical conveying volume is calculated every half hour. When the ratio is lower than 96%, the system automatically analyzes the cause, determines whether there are problems such as pipeline blockage or pump performance degradation, and issues a prompt message.

[0032] 2. Mixing uniformity test: Take samples from the outlet of the static mixing tube regularly (every 3 hours) and use professional testing equipment (such as laser particle size analyzer, component analyzer, etc.) to test the component distribution and particle dispersion of energetic materials, evaluate the mixing uniformity, and ensure that the mixing effect meets the production requirements.

Claims

1. A high-safety integrated mixing and flow device for high-solids-content energetic materials based on acoustic resonance, characterized in that, The system includes a pump casing (1), a driver (2), a pump head (3), a flexible hose (4), a sealing flange (5), mixing blades (6), a connecting rod (7), a housing (8), a feed inlet (9), an acoustic resonance device (10), a roller (11), a high-shear homogenizer (12), and a discharge outlet (13). The housing (8) is provided with a feed inlet (9) and a discharge outlet (13). The mixing blades (6) are installed inside the housing (8) near the feed inlet (9) via the connecting rod (7) to form a static mixing structure. The pump casing (1) is fixed to the housing. Inside the body (8), the driver (2) is installed outside the pump housing (1), the pump head (3) is set inside the pump housing (1) and connected to the driver (2), the elastic hose (4) is installed inside the pump head (3), and its two ends are connected to the discharge end of the static mixing structure and the feed end of the high shear homogenizer (12) respectively through the sealing flange (5); the roller (11) is set on the pump head (3), and the acoustic resonance device (10) is installed at the roller (11); the high shear homogenizer (12) is fixed inside the housing (8) near the discharge port (13).

2. The high-safety integrated mixing and flow device according to claim 1, characterized in that, The elastic hose (4) is a specially made high-pressure resistant, corrosion resistant, and wear resistant hose; the mixing blades (6) are arranged in an alternating manner, with an included angle of 45° between adjacent mixing blades (6), and the surface of the mixing blades (6) has an anti-slip and wear-resistant coating with a coating thickness of 0.2mm; The acoustic resonance device (10) includes a sound wave generator, a resonant cavity, and a conductive component. The frequency adjustment range of the sound wave generator is 20kHz-40kHz, and the volume of the resonant cavity is 50cm³. 3 The sealing flange (5) and the connection parts of the elastic hose (4), static mixing structure, and high shear homogenizer (12) are all equipped with sealing rings. The sealing rings are made of fluororubber with a Shore hardness of 75HA.

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