A compressed gas foam generating device

Abstract

The utility model relates to a compressed gas foam generating device belongs to coal mine fire prevention technical field. The utility model discloses water inlet unit, jet mixing unit, static mixing unit, foaming unit and foam output unit are sequentially communicated along the medium flow direction. The utility model adopts three -level net -like foaming structure, and the gas -liquid contact and bubble dispersion effect are strengthened gradually, and the foam expansion multiple and stability have been improved significantly, the water pressure is changed through the adjustment water inlet valve, thereby the negative pressure intensity that jet nozzle produces is adjusted, realizes the quantitative inhalation of foaming agent, makes the ratio of water and foaming agent can be accurately controlled under different working conditions, through the liquid suction of jet nozzle negative pressure and the multiple disturbance effect of static helical spoiler, make water and foaming agent fully homogeneous mixture. The foam bubble particle size distribution of the utility model finally output is even, and the structure is compact, has higher expansion degree and covering performance, can be applied to mine fire prevention and disaster emergency disposal efficiently.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine fire prevention and extinguishing technology, and relates to a compressed gas foam generating device. Background Technology

[0002] In underground coal mine goaf areas, due to complex geological conditions and inadequate ventilation systems, air leakage is common. This causes oxygen to enter the goaf and react with residual coal at low temperatures, easily leading to spontaneous combustion or even coal fires. To effectively seal air leakage channels and reduce oxygen concentration, foam injection technology is widely used. Existing foam generators typically rely on electric power or complex mechanical structures, which not only limit their use in explosion-proof underground environments but also suffer from problems such as difficulty in precisely controlling the mixing ratio of the foam mixture, uneven density, and low foaming efficiency. These limitations fail to meet the long-term, stable, and efficient fire prevention and extinguishing needs of underground coal mines. Utility Model Content

[0003] The purpose of this invention is to provide a compressed gas foam generator that can effectively meet the fire prevention and extinguishing needs in coal mines.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A compressed gas foam generating device includes: a water inlet unit, a jet mixing unit, a static mixing unit, a foaming unit, and a foam output unit that are connected sequentially along the medium flow direction. The water inlet unit includes a water inlet pipe, one end of which is connected to a water source; The jet mixing unit includes a jet cavity, one end of which is connected to the other end of a water inlet pipe, and the other end of which is connected to a jet nozzle. The jet nozzle forms a negative pressure zone within the jet cavity under the action of water flow. The jet cavity is provided with a liquid inlet pipe, the outlet of which is connected to the negative pressure zone within the jet cavity, and the inlet of which is connected to a foaming agent. Under the action of the negative pressure, the foaming agent is drawn in and mixed with water. The static mixing unit includes a mixing disturbance cavity, and a static spiral turbulence diffuser is provided inside the mixing disturbance cavity; The foaming unit is provided with an air inlet pipe, which introduces compressed gas into the foaming unit along the medium flow direction. A primary foaming device and a secondary foaming device are sequentially arranged in the foaming unit along the medium flow direction. The foam output unit includes a foam delivery chamber and a three-stage foaming device disposed within the foam delivery chamber.

[0005] Furthermore, a water flow meter, a water pressure gauge, and an inlet valve for adjusting the water pressure in the inlet pipe are also installed on the inlet pipe.

[0006] Furthermore, the static spiral turbulence diffuser has a spiral blade structure and is continuously arranged in the mixing and turbulence cavity along the medium flow direction.

[0007] Furthermore, the foaming unit is also provided with an air inlet, and the outlet end of the air inlet pipe is coaxially arranged with the air inlet, which is coaxially connected to the primary foaming device.

[0008] Furthermore, the intake pipe is located downstream of the static mixing unit and upstream of the intake port, with a space between the outlet end of the intake pipe and the intake port.

[0009] Furthermore, the primary foaming device is a spherical mesh nozzle, the secondary foaming device is a hollow cylindrical mesh foaming component, and the tertiary foaming device is a cross-sectional mesh.

[0010] Furthermore, the hollow cylindrical mesh foam component has an opening at its upstream end, and its surrounding and downstream ends are all mesh structures.

[0011] Furthermore, the foaming unit also includes a foaming cavity, and a spherical mesh nozzle and a hollow cylindrical mesh foaming component are both disposed in the foaming cavity, with the upstream end of the hollow cylindrical mesh foaming component connected to the foaming cavity.

[0012] Compared with the prior art, this utility model has the following advantages: (1) High mixing uniformity: Through the negative pressure suction of the jet nozzle and the multiple disturbances of the static spiral turbulent device, the water and foaming agent are fully homogeneously mixed before entering the foaming zone, ensuring the consistency of foam generation.

[0013] (2) High foaming efficiency: The device adopts a three-stage mesh foaming structure, which enhances the gas-liquid contact and bubble dispersion effect step by step, significantly improving the foam expansion ratio and stability.

[0014] (3) The ratio of foaming agent to water is controllable: by adjusting the water inlet valve to change the water pressure, the negative pressure generated by the jet nozzle can be adjusted to achieve quantitative intake of foaming agent, so that the ratio of water to foaming agent can be precisely controlled under different working conditions.

[0015] (4) High safety and reliability: The air inlet pipe is coaxially arranged to ensure that the gas is introduced along the water flow direction, effectively avoiding liquid backflow and gas-liquid turbulence, and improving operational safety.

[0016] (5) Excellent foam quality: The foam output after three-stage foaming has a uniform particle size distribution, dense structure, high expansion and coverage performance, and can be efficiently applied to mine fire prevention and extinguishing and disaster emergency response. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a perspective view of a compressed gas foam generating device according to the present invention; Figure 2 This is an internal structural diagram of a compressed gas foam generator according to the present invention; Figure 3 This is a perspective view of the head section of the static spiral turbulence generator in a compressed gas foam generating device according to this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1-Water inlet unit, 11-Water inlet pipe, 12-Water flow meter, 13-Water inlet valve, 14-Water pressure gauge, 2-Jet mixing unit, 21-Jet cavity, 22-Jet nozzle, 23-Liquid inlet pipe, 3-Static mixing, 31-Static spiral turbulent device, 32-Mixing turbulence cavity, 4-Fogging unit, 41-Air inlet pipe, 42-Air inlet hole, 43-Fogging cavity, 44-Spherical mesh nozzle, 45-Hollow cylindrical mesh foaming component, 5-Fogging output unit, 51-Cross-section mesh, 52-Fogging delivery cavity. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] like Figure 1 As shown, a compressed gas foam generating device includes: a water inlet unit 1, a jet mixing unit 2, a static mixing unit 3, a foaming unit 4, and a foam output unit 5, which are connected sequentially along the medium flow direction.

[0022] like Figure 2 As shown, the water inlet unit 1 includes an inlet pipe 11, and a water flow meter 12, an inlet valve 13, and a water pressure gauge 14 installed on the inlet pipe 11. The inlet end of the inlet pipe 11 is connected to a water source, supplying water to the device via the inlet pipe 11. The inlet valve 13 is used to regulate the water pressure in the inlet pipe 11, thereby changing the negative pressure intensity generated in the jet chamber 21 of the jet mixing unit 2, and thus controlling the mixing ratio of water and foaming agent according to different operating conditions, for example, maintaining the foaming agent to water ratio within a commonly used range such as 0.3% or 0.5%. The water flow meter 12 and the water pressure gauge 14 are used to monitor the inlet water parameters in real time.

[0023] The jet mixing unit 2 includes a jet cavity 21, the inlet end of which is connected to the outlet end of the water inlet pipe 11, and the outlet end of the jet cavity 21 is connected to a jet nozzle 22. The jet nozzle 22 forms a negative pressure zone in the jet cavity 21 under the action of water flow. The jet cavity 21 is provided with a liquid inlet pipe 23, the outlet of which is connected to the negative pressure zone in the jet cavity 21, and the inlet of the liquid inlet pipe 23 is connected to a foaming agent. Under the action of negative pressure, the foaming agent is drawn in and mixed with water.

[0024] The static mixing unit 3 includes a mixing and disturbance cavity 32, within which a static spiral baffle 31 is installed. The foam-water mixture enters the static spiral baffle 31 through a jet nozzle 22, where it is thoroughly mixed under the agitation of the spiral structure, achieving homogeneous mixing of water and foaming agent and improving the consistency and stability of the mixture. Figure 3 As shown, the static spiral turbulence diffuser 31 is continuously arranged in the mixing turbulence cavity 32 along the medium flow direction to turbulently homogenize the mixture.

[0025] The foaming unit 4 includes an air inlet pipe 41, an air inlet 42, a foaming cavity 43, a spherical mesh nozzle 44, and a hollow cylindrical mesh foaming element 45. The air inlet pipe 41 is located downstream of the static mixing unit 3 and upstream of the air inlet 42. Compressed gas is introduced into the inlet end of the air inlet pipe 41, and a space is left between the outlet end of the air inlet pipe 41 and the air inlet 42. This space allows compressed gas to be introduced into the air inlet 42 without affecting the entry of the mixed liquid into the air inlet 42, ensuring effective mixing of the gas and the mixed liquid. Furthermore, the outlet end of the air inlet pipe 41 is coaxial with the direction of the air inlet 42 to suppress gas backflow and liquid recirculation. The air inlet pipe 41 introduces compressed gas into the foaming cavity 43 along the medium flow direction through the air inlet 42. The radii of the air inlet pipe 41 and the air inlet 42 are smaller than the radius of the foaming cavity 43. Within the foaming chamber 44, a spherical mesh nozzle 44, coaxially connected to the air inlet 42, is positioned along the medium flow direction. A hollow cylindrical mesh foaming element 45 is positioned downstream of the spherical mesh nozzle 44. The spherical mesh nozzle 44 is used for the first foaming of the gas-liquid mixture, and the hollow cylindrical mesh foaming element 45 is used for the second foaming. The hollow cylindrical mesh foaming element 45 has an open upstream end, and its sides and downstream end are mesh structures. The upstream end of the hollow cylindrical mesh foaming element 45 is connected to the foaming chamber 44 containing the spherical mesh nozzle 44, allowing all the bubbles and gas-liquid mixture from the first foaming to pass through the hollow cylindrical mesh foaming element 45 for the second foaming. Simultaneously, the hollow cylindrical mesh foaming element 45 can further refine the bubbles from the first foaming, increasing the expansion ratio and stability.

[0026] The foam output unit 5 includes a foam conveying chamber 52 and a cross-sectional mesh 51 disposed within the foam conveying chamber 52. The cross-sectional mesh 51 abuts against the inner wall of the foam conveying chamber 52. The cross-sectional mesh 51 is used to perform final shaping and homogenization of the foam after secondary foaming, achieving tertiary foaming. The foam conveying chamber 52 then stably outputs the final foam to the external application location. The final output foam has a dense structure, small bubble size, and strong stability, making it suitable for sealing air leaks in underground goaf areas and inhibiting coal oxidation.

[0027] It is worth noting that this utility model does not include an electrically driven component, and relies solely on the inlet water pressure and compressed gas energy to complete the liquid absorption, mixing and foaming process.

[0028] The present embodiment has now been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the present invention. Of course, the above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the content of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention and should be protected by the present invention.

Claims

1. A compressed gas foam generating device, characterized in that, include: The water inlet unit, jet mixing unit, static mixing unit, foaming unit, and foam output unit are connected sequentially along the medium flow direction; The water inlet unit includes a water inlet pipe, one end of which is connected to a water source; The jet mixing unit includes a jet cavity, one end of which is connected to the other end of a water inlet pipe, and the other end of which is connected to a jet nozzle. The jet nozzle forms a negative pressure zone within the jet cavity under the action of water flow. The jet cavity is provided with a liquid inlet pipe, the outlet of which is connected to the negative pressure zone within the jet cavity, and the inlet of which is connected to a foaming agent. Under the action of the negative pressure, the foaming agent is drawn in and mixed with water. The static mixing unit includes a mixing disturbance cavity, and a static spiral turbulence diffuser is provided inside the mixing disturbance cavity; The foaming unit is provided with an air inlet pipe, which introduces compressed gas into the foaming unit along the medium flow direction. A primary foaming device and a secondary foaming device are sequentially arranged in the foaming unit along the medium flow direction. The foam output unit includes a foam delivery chamber and a three-stage foaming device disposed within the foam delivery chamber.

2. The compressed gas foam generator according to claim 1, characterized in that, The inlet pipe is also equipped with a water flow meter, a water pressure gauge, and an inlet valve for adjusting the water pressure in the inlet pipe.

3. The compressed gas foam generator according to claim 1, characterized in that, The static spiral turbulence diffuser has a spiral blade structure and is continuously arranged in the mixing and disturbance cavity along the medium flow direction.

4. The compressed gas foam generator according to claim 1, characterized in that, The foaming unit is also provided with an air inlet, and the outlet end of the air inlet pipe is coaxially arranged with the air inlet. The air inlet is coaxially connected to the primary foaming device.

5. A compressed gas foam generator according to claim 4, characterized in that, The intake pipe is located downstream of the static mixing unit and upstream of the intake port, with a space between the outlet end of the intake pipe and the intake port.

6. A compressed gas foam generating device according to claim 1, characterized in that, The primary foaming device is a spherical mesh nozzle, the secondary foaming device is a hollow cylindrical mesh foaming component, and the tertiary foaming device is a cross-sectional mesh.

7. A compressed gas foam generator according to claim 6, characterized in that, The hollow cylindrical mesh foam component has an opening at its upstream end, and its surrounding and downstream ends are all mesh structures.

8. A compressed gas foam generator according to claim 7, characterized in that, The foaming unit also includes a foaming cavity, and a spherical mesh nozzle and a hollow cylindrical mesh foaming component are both disposed in the foaming cavity. The upstream end of the hollow cylindrical mesh foaming component is connected to the foaming cavity.

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