Gas-liquid two-phase flow coaxial mixing cavity device

Abstract

The invention provides a gas-liquid two-phase flow coaxial mixing cavity device. The gas-liquid two-phase flow coaxial mixing cavity device comprises a first Venturi tube, a second Venturi tube and a quick connector, the throat diameter of the second Venturi tube is smaller than that of the first Venturi tube; the diffusion section of the second venturi tube is connected with the contraction section of the first venturi tube through a quick joint; the contraction section of the second Venturi tube is connected with a straight tube; the inlet section of the second Venturi tube is connected with high-pressure water, the inlet section of the first Venturi tube is connected with an inert gas pipeline, and the inlet section of the straight tube is connected with a high-power foaming liquid pipeline; and a turbulent flow mixing device is arranged in a throat of the first Venturi tube. According to the device, the pulsation phenomenon in a pipeline caused by improper flow or pressure design or control of air flow and liquid flow in the using process is avoided, foam liquid is efficiently mixed and released, the device is easy to deploy, flexible in response and convenient to operate due to the compact and light design, and the efficient maintenance and upgrading capacity is guaranteed through the modular structure.

Description

Technical Field

[0001] The present application relates to the field of safety and disaster relief equipment, and in particular to a gas-liquid two-phase flow coaxial mixing chamber device. Background Art

[0002] With the improvement of the intelligence level of mines, the production intensity of mines has also been greatly improved. A large number of fully mechanized mining and fully mechanized caving working faces with large mining heights have emerged. Compared with general coal seam mining, the thickness of coal cutting increases, the amount of coal left in the goaf area, and the amount of air leakage in the goaf area increase. The carbon monoxide produced by the accelerated oxidation and decomposition of the coal left in the goaf is very likely to cause the return air corner of the working face, or even the return air flow over-limit alarm. The foam generating device in traditional coal mines is often troubled by bulky size, low efficiency and complex operation. In emergency situations, such as fires or coal dust explosions, it is extremely important to quickly and effectively generate and deploy foam, but existing technologies often cannot meet this demand. In addition, since traditional devices require a large space and are not easy to move in a small mine environment, their flexibility and timeliness are limited. Existing foam generating devices often rely on external power drives, such as electric pumps or gas pressure. The application of these driving methods in coal mines is greatly limited, especially in environments where power supply and compressed gas cannot be used. In addition, current equipment often cannot accurately control the ratio when mixing air, water and foam liquid, which directly affects the quality of the foam and the effect of plugging air leakage. The more commonly used inert gases in underground fire prevention and extinguishing are carbon dioxide and nitrogen. Inert gases are filled in the foam. During the fire extinguishing process, the dual synergistic effect of foam and inert gas is used to extinguish the fire, which improves the fire extinguishing efficiency. The performance of the foam is also one of the main factors that determine the fire extinguishing efficiency of the inert gas foam fire extinguishing system. Therefore, the foam generator is a key component of the inert gas foam fire extinguishing system. Summary of the invention

[0003] The present application provides a gas-liquid two-phase flow coaxial mixing chamber device, which is used to solve the problems of complex operation process of the foaming device, unstable foam quality, high maintenance cost, and difficulty in application in confined spaces.

[0004] An embodiment of the present application provides a gas-liquid two-phase flow coaxial mixing chamber device, comprising a first venturi tube, a second venturi tube and a quick connector; the throat diameter of the second venturi tube is smaller than the throat diameter of the first venturi tube; the diffusion section of the second venturi tube is connected to the contraction section of the first venturi tube through the quick connector; the contraction section of the second venturi tube is connected to a straight pipe; the inlet section of the first venturi tube is connected to an inert gas pipeline, the inlet section of the second venturi tube is connected to a high-pressure water pipeline, and the inlet section of the straight pipe is connected to a high-power foaming liquid pipeline; a turbulent mixing device is arranged in the throat of the first venturi tube.

[0005] In a feasible implementation, a first baffle is provided in the contraction section of the first venturi tube. The first baffle is tilted and connected to the inner wall of the contraction section of the first venturi tube. The angle between the first baffle and the top line of the first venturi tube is A, and the two first baffles are symmetrically arranged.

[0006] In a feasible implementation, a second baffle is provided in the contraction section of the second Venturi tube, the second baffle is tilted and connected to the inner wall of the contraction section of the second Venturi tube, the angle between the second baffle and the top line of the second Venturi tube is B, and the two second baffles are symmetrically arranged.

[0007] In a feasible implementation, the inlet section of the first Venturi tube is provided with a first flange joint, and the first Venturi tube is connected to the inert gas pipeline through the first flange joint; the inlet section of the second Venturi tube is provided with a second flange joint, and the second Venturi tube is connected to the inert gas pipeline through the second flange joint, and the end of the straight tube away from the second Venturi tube is provided with a leak-proof quick-release joint.

[0008] In a feasible implementation, the turbulent mixing device includes a front bracket, a rear bracket, a connecting shaft and a spiral blade arranged in the first venturi tube; the front bracket is fixedly connected to the inner wall of the throat of the first venturi tube, the rear bracket is fixedly connected to the inner wall of the throat of the first venturi tube, one end of the connecting shaft is rotatably connected to the front bracket, the other end of the connecting shaft is rotatably connected to the rear bracket, and the spiral blade is fixedly connected to the connecting shaft along the connecting shaft.

[0009] In a feasible implementation, the spiral blade is a spiral wire mesh structure. The spiral wire mesh structure changes the flow direction of the fluid on the one hand, and on the other hand, the mesh structure reduces the resistance in the forward direction of the fluid and makes the size of the bubbles more uniform.

[0010] In a feasible implementation, the angle A is 21°±2°.

[0011] In a feasible implementation, the angle B is 21°±2°.

[0012] The present application provides a gas-liquid two-phase flow coaxial mixing chamber device including a first venturi tube, a second venturi tube and a quick connector. The venturi tube can effectively reduce the resistance of the fluid flow and has low energy consumption. The throat diameter of the second venturi tube is smaller than the throat diameter of the first venturi tube, which is convenient for plugging and matching. The diffusion section of the second venturi tube is connected to the contraction section of the first venturi tube through the quick connector, and the device is easy to assemble. The contraction section of the second venturi tube is connected with a straight pipe; the inlet section of the first venturi tube is connected to the inert gas pipeline, the inlet section of the second venturi tube is connected to the high-pressure water pipeline, and the inlet section of the straight pipe is connected to the high-power foaming liquid pipeline; a turbulent mixing device is arranged in the throat of the first venturi tube. The innovative structural design and parameter selection of this application avoid pulsation in the pipeline caused by improper design or control of air flow and liquid flow or pressure during use, and achieve efficient mixing and release of foam liquid. The compact and lightweight design makes the device not only easy to deploy, but also superior to traditional equipment in terms of response flexibility and ease of operation. The modular structure ensures efficient maintenance and upgrade capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 It is a schematic structural diagram of a gas-liquid two-phase flow coaxial mixing chamber device provided in the present application;

[0015] Figure 2 It is a schematic diagram of the main structure of the turbulent mixing device in the gas-liquid two-phase flow coaxial mixing chamber device provided by the present application;

[0016] Figure 3 It is a side view schematic diagram of the turbulent mixing device in the gas-liquid two-phase flow coaxial mixing chamber device provided in the present application.

[0017] Description of reference numerals:

[0018] Among them, 1-first venturi tube; 11-first baffle; 12-first flange joint; 2-second venturi tube; 21-second baffle; 22-second flange joint; 3-quick connector; 4-straight pipe; 41-anti-permeation quick release connector; 5-turbulent mixing device; 51-front bracket; 52-rear bracket; 53-connecting shaft; 54-spiral blade. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0020] The foam generating devices in traditional coal mines are often plagued by bulky size, low efficiency and complex operation. In emergency situations, such as fire or coal dust explosion, it is extremely important to quickly and effectively generate and deploy foam, but the existing technology often cannot meet this demand. In addition, since the traditional device requires a large space and is not easy to move in the narrow mine environment, the flexibility and timeliness of its use are limited. Existing foam generating devices often rely on external power drives, such as electric pumps or gas pressure. The application of these driving methods in coal mines is greatly limited, especially in environments where power supply and compressed gas cannot be used. In the gas-liquid two-phase flow coaxial mixing chamber device provided in the present application, the innovative structural design and parameter selection avoid the pulsation phenomenon in the pipeline caused by improper design or control of air flow and liquid flow or pressure during use, and realize the automatic absorption, efficient mixing and release of high-multiple foaming liquid. The compact and lightweight design makes the device not only easy to deploy, but also superior to traditional equipment in response flexibility and ease of operation. The modular structure ensures efficient maintenance and upgrade capabilities.

[0021] The structure of the gas-liquid two-phase flow coaxial mixing chamber device provided in the present application is described in detail below in conjunction with the accompanying drawings.

[0022] Reference Figure 1 As shown, an embodiment of the present application provides a gas-liquid two-phase flow coaxial mixing chamber device, comprising a first venturi tube 1, a second venturi tube 2 and a quick connector 3; the throat diameter of the second venturi tube 2 is smaller than the throat diameter of the first venturi tube 1; the diffusion section of the second venturi tube 2 is connected to the contraction section of the first venturi tube 2 through the quick connector 3; the contraction section of the second venturi tube 2 is connected with a straight pipe 4; the inlet section of the first venturi tube 1 is connected to an inert gas pipeline, the inlet section of the second venturi tube 2 is connected to a high-pressure water pipeline, and the inlet section of the straight pipe 4 is connected to a high-multiple foaming liquid pipeline; a turbulent mixing device 5 is arranged in the throat of the first venturi tube 1.

[0023] The structures of the first venturi tube 1 and the second venturi tube 2 mainly include an inlet section, a contraction section, a throat and a diffusion section. The inlet section is a short cylindrical section, which is the starting part of the fluid entering the venturi tube. The contraction section is in the shape of a conical tube, which is the gradually contracting part of the venturi tube, and its function is to gradually accelerate the fluid when passing through. The throat is a short straight pipe section, which is the narrowest part of the venturi tube, namely the throat. In the throat, the velocity of the fluid reaches the maximum and the static pressure reaches the minimum. The diffusion section is the gradually expanding part of the venturi tube. In the diffusion section, the velocity of the fluid gradually decreases and the static pressure gradually increases, so that the kinetic energy of the fluid is converted into static pressure energy. The second venturi tube 2 is plugged into the first venturi tube 1 through a quick connector 3, which is quick and convenient to assemble and flexible to operate. The quick connector 3 is made of stainless steel. The specific model is determined according to the diameters of the first venturi tube 1 and the second venturi tube 2. It can be connected or disconnected without tools, which has the advantages of saving time, labor and environmental protection. During long-term use, once the first venturi tube 1 or the second venturi tube 2 is worn or damaged, only the damaged first venturi tube 1 or the second venturi tube 2 can be replaced separately, without replacing both. The connection between the straight tube 4 and the second venturi tube 2 can be fixed by welding or other methods, or a quick connector can be provided for detachable connection. The modular structural design of the device ensures efficient maintenance and upgrade capabilities, significantly reducing the cost of long-term use.

[0024] The working principle of the Venturi tube is mainly based on the Bernoulli equation, that is, in an incompressible stable fluid, as the velocity increases, the static pressure of the fluid will decrease; conversely, as the velocity decreases, the static pressure of the fluid will increase. Specifically, when the fluid passes through the Venturi tube, the flow velocity reaches the maximum and the static pressure reaches the minimum at the narrowest part of the pipe (the throat). As the velocity of the fluid increases, the static pressure energy is converted into dynamic pressure energy. After the throat, the pipe gradually expands, the flow velocity gradually decreases, the static pressure gradually increases, and the dynamic pressure energy is converted into static pressure energy again. When the two fluids enter the pipe through the two sides of the Venturi tube respectively, they will be strongly mixed together by the high-speed fluid at the throat.

[0025] The gas-liquid two-phase flow coaxial mixing chamber device structure in this embodiment includes two Venturi chambers, and the second Venturi tube 2 includes a primary Venturi chamber. High-pressure water automatically absorbs high-multiple foaming liquid into the primary Venturi chamber through the inlet section of the second Venturi tube 2, and the two are preliminarily mixed in the primary Venturi chamber. After the mixing is completed, the water enters the first Venturi tube 1 through the diffusion end of the second Venturi tube 2. At this time, inert gas is filled from the inlet section of the first Venturi tube 1, and further mixed in the secondary Venturi chamber and the turbulent mixing section in the first Venturi tube 1. During the mixing process, bubbles are generated and broken, and cross-flow is continuously performed to mix gas and liquid, forming stable bubbles. The evenly distributed and dense bubbly two-phase flow is ejected at a high speed from the diffusion section of the first Venturi tube 1 to generate high-quality inert bubbles.

[0026] In some embodiments, a first baffle 11 is disposed in the contraction section of the first venturi tube 1, the first baffle 11 is disposed obliquely, the angle between the first baffle 11 and the top line of the first venturi tube 1 is A, and the two first baffles 11 are disposed symmetrically. The inclined first baffle 11 strengthens the acceleration effect of the contraction section of the first venturi tube 1 on the fluid, so that the fluid flowing through the first venturi tube has a faster flow rate.

[0027] In some embodiments, a second baffle 21 is disposed in the contraction section of the second venturi tube 2, the second baffle 21 is disposed obliquely, the included angle between the second baffle 21 and the top line of the second venturi tube 2 is B, and the two second baffles 21 are disposed symmetrically. The inclined second baffle 21 strengthens the acceleration effect of the contraction section of the second venturi tube 2 on the fluid, so that the fluid flowing through the second venturi tube 2 has a faster flow rate.

[0028] In some embodiments, the inlet section of the first venturi tube 1 is provided with a first flange joint 12, and the first venturi tube 1 is connected to the inert gas pipeline through the first flange joint 12; the inlet section of the second venturi tube 2 is provided with a second flange joint 22, and the second venturi tube 2 is connected to the inert gas pipeline through the second flange joint 22, and the end of the straight pipe 4 away from the second venturi tube 2 is provided with an anti-leakage quick-release joint 41. The flange joint is easy to disassemble, has high strength and good sealing performance. When the flange is connected, it is only necessary to align the two flanges and then fix them with bolts. The installation and maintenance process is simple and convenient, which can save time and labor costs. At the same time, the flange connection can withstand greater pressure and tension, has good sealing performance, and can effectively prevent fluid leakage. The anti-leakage quick-release joint 41 can also adopt the structural form of a flange joint, or can adopt the form of a plug-in or snap-on joint. In addition, sensors can be set at the inlet section of the first venturi tube 1, the inlet section of the second venturi tube 2 or the inlet section of the straight tube 4 to measure the volumes of the inert gas, high-pressure water and high-multiple foaming liquid, and accurately control the ratio of high-pressure water, high-multiple foaming liquid and inert gas.

[0029] Reference Figure 2 and Figure 3 In some embodiments, the turbulent mixing device 5 includes a front bracket 51, a rear bracket 52, a connecting shaft 53 and a spiral blade 54 arranged in the first venturi tube 1; the front bracket 51 is fixedly connected to the inner wall of the throat of the first venturi tube 1, the rear bracket 52 is fixedly connected to the inner wall of the throat of the first venturi tube 1, one end of the connecting shaft 53 is rotatably connected to the front bracket 51, the other end of the connecting shaft 53 is rotatably connected to the rear bracket 52, and the spiral blade 54 is fixedly connected to the connecting shaft 53 along the connecting shaft 53.

[0030] During the mixing process of high-pressure water, inert gas and high-multiple foaming liquid, the turbulence and vortex generated by the spoiler destroy the stability of the gas-liquid interface and promote the diffusion and dissolution of gas molecules into the liquid. This turbulence can not only increase the contact area between gas and liquid, but also reduce the size of bubbles, making the gas easier to be absorbed by the liquid. In addition, the spoiler can also enhance the contact and mixing effect between the inert gas and the high-multiple foaming liquid by changing the direction and speed of fluid flow, avoiding the situation where the gas concentration is too high or too low, thereby improving the mixing effect and quality.

[0031] In some embodiments, the spiral blade 54 is a spiral wire mesh structure.

[0032] In some embodiments, the angle A is 21°±2°.

[0033] In some embodiments, the angle B is 21°±2°.

[0034] Optimization results based on fluid dynamics and experimental verification. This cone angle range helps to achieve the best fluid acceleration and pressure drop effects in the Venturi tube. When the fluid passes through the contraction section of the Venturi tube, the setting of the cone angle will affect the velocity and pressure changes of the fluid. A smaller cone angle will cause the fluid to accelerate prematurely in the contraction section, and may not be able to fully utilize the gradual contraction and expansion characteristics of the Venturi tube to achieve effective pressure drop and flow measurement. A larger cone angle may cause excessive resistance to the fluid in the contraction section, affecting the smooth passage of the fluid and the accuracy of the measurement. After theoretical calculation and experimental verification, the cone angle range of 21°±2° can achieve a balance between fluid acceleration and pressure drop, allowing the Venturi tube to perform well in various application scenarios, and is an ideal choice for the contraction section of the Venturi tube.

[0035] It should be noted that the specific design and application of the Venturi tube may vary depending on the fluid medium, working conditions and measurement requirements. Therefore, in practical applications, it may be necessary to optimize and adjust the cone angle of the Venturi tube's contraction section according to the specific situation.

[0036] According to the above-mentioned technical features, the gas-liquid two-phase flow coaxial mixing chamber device provided by the present application, when in use, high-pressure water enters the primary venturi chamber in the second venturi tube 2 from the inlet section of the second venturi tube 2, at this time, the high-multiple foaming liquid is automatically sucked into the primary venturi chamber from the straight tube 4, and the high-multiple foaming liquid and high-pressure water are mixed. The mixed solution is referred to as a mixed solution, and the mixed solution enters the secondary venturi chamber in the first venturi tube 1 from the diffusion section of the second venturi tube 2. At this time, the inlet section of the first venturi 1 is filled with inert gas, and the inert gas is further mixed with the mixed solution. The mixed solution is ejected at high speed from the diffusion section of the first venturi tube 1 through the turbulent mixing device 5 in the throat, generating high-quality inert bubbles.

[0037] Compared with the prior art, this application has the following advantages:

[0038] 1. Improved energy efficiency: The gas-liquid two-phase flow coaxial mixing chamber device adopts the independently developed gas-liquid two-phase flow coaxial mixing chamber structure design, and uses the pressure difference of the fluid itself to inhale inert gas and high-multiple foaming liquid. It is convenient and fast, reduces dependence on external power sources, and significantly improves on-site use efficiency.

[0039] 2. Ease of operation: Compared with traditional foam generation systems, the gas-liquid two-phase flow coaxial mixing chamber device can be quickly deployed and start the foam generation process without complex setup or debugging, which is particularly valuable in emergency situations and can shorten response time and improve disaster relief efficiency.

[0040] 3. Consistency and quality of generated foam: Since the carefully designed device provides a stable negative pressure environment, ensuring the consistency of the mixing ratio of inert gas and foam liquid, the generated foam characteristics (such as size, density and persistence) are more stable through key steps such as optimizing the gas-liquid mixing ratio and testing the equilibrium bubble breaking mechanism.

[0041] 4. Compact structure, suitable for use in narrow spaces: For application places with limited space such as coal mines, the invented device adopts a modular and compact design, which is easy to carry and arrange in confined spaces with narrow passages.

[0042] 5. Reduced maintenance and operating costs: Since the device design adopts modular components that can be quickly disassembled and reassembled, maintenance and replacement of parts become very simple and quick, which not only reduces the need for tools and maintenance time, but also significantly reduces the cost of long-term use.

[0043] 6. Improved reliability: The optimization of the foam liquid supply system in the invention ensures a stable supply of foam liquid even under pressure fluctuations, avoiding the degradation of foam quality caused by unstable foam liquid supply, thereby improving the reliability of the entire system.

[0044] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0045] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A gas-liquid two-phase flow coaxial mixing chamber device, characterized in that: The invention comprises a first venturi tube (1), a second venturi tube (2) and a quick connector (3); the throat diameter of the second venturi tube (2) is smaller than the throat diameter of the first venturi tube (1); the diffusion section of the second venturi tube (2) is connected to the contraction section of the first venturi tube (1) through the quick connector (3); the contraction section of the second venturi tube (2) is connected to a straight pipe (4); the inlet section of the first venturi tube (1) is connected to an inert gas pipeline, the inlet section of the second venturi tube (2) is connected to a high-pressure water pipeline, and the inlet section of the straight pipe (4) is connected to a high-power foaming liquid pipeline; and a turbulent mixing device (5) is arranged in the throat of the first venturi tube (1).

2. The gas-liquid two-phase flow coaxial mixing chamber device according to claim 1, characterized in that: A first baffle (11) is arranged in the contraction section of the first venturi tube (1); the first baffle (11) is arranged obliquely and connected to the inner wall of the contraction section of the first venturi tube (1); the angle between the first baffle (11) and the top straight line of the first venturi tube (1) is A; and the two first baffles (11) are arranged symmetrically.

3. The gas-liquid two-phase flow coaxial mixing chamber device according to claim 2, characterized in that: A second baffle (21) is arranged in the contraction section of the second venturi tube (2); the second baffle (21) is arranged obliquely and connected to the inner wall of the contraction section of the second venturi tube (2); the included angle between the second baffle (21) and the top straight line of the second venturi tube (2) is B; and the two second baffles (21) are symmetrically arranged.

4. The gas-liquid two-phase flow coaxial mixing chamber device according to claim 1, characterized in that: The inlet section of the first venturi tube (1) is provided with a first flange joint (12), and the first venturi tube (1) is connected to the inert gas pipeline via the first flange joint (12); the inlet section of the second venturi tube (2) is provided with a second flange joint (22), and the second venturi tube (2) is connected to the inert gas pipeline via the second flange joint (22); and an anti-leakage quick-release joint (41) is provided at one end of the straight tube (4) away from the second venturi tube (2).

5. The gas-liquid two-phase flow coaxial mixing chamber device according to claim 1, characterized in that: The turbulent mixing device (5) comprises a front bracket (51), a rear bracket (52), a connecting shaft (53) and a spiral blade (54) arranged in the first venturi tube (1); the front bracket (51) is fixedly connected to the inner wall of the throat of the first venturi tube (1), the rear bracket (52) is fixedly connected to the inner wall of the throat of the first venturi tube (1), one end of the connecting shaft (53) is rotatably connected to the front bracket (51), the other end of the connecting shaft (53) is rotatably connected to the rear bracket (52), and the spiral blade (54) is arranged along the connecting shaft (53) and is fixedly connected to the connecting shaft (53).

6. The gas-liquid two-phase flow coaxial mixing chamber device according to claim 5, characterized in that: The spiral blade (54) is a spiral wire mesh structure.

7. The gas-liquid two-phase flow coaxial mixing chamber device according to claim 2, characterized in that: The angle A is 21°±2°.

8. The gas-liquid two-phase flow coaxial mixing chamber device according to claim 3, characterized in that: The angle B is 21°±2°, and the angle B is greater than the angle A.

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