Foam-liquid mixing type gel foam generator

Abstract

The utility model discloses a foam-liquid mixing type gel foam generator which comprises a top cover, a shell, a water mist nozzle and a screen, the shell is divided into a feeding cavity and a mixing cavity which are communicated, the feeding cavity and the mixing cavity are distributed in a shrunk conical structure from the feeding cavity to the mixing cavity, the shell is installed at the inlet end of the feeding cavity in a threaded mode, a water mist spray head is installed at the center of the interior of the top cover and communicated with a liquid inlet in the exterior of the top cover, and a plurality of foam inlets are evenly distributed in the shell of the feeding cavity in the axial direction; the cross-linking reaction activity of the cross-linking agent and the gel is improved, the cross-linking reaction is more sufficient, and the formed gel foam is more uniform; the mixing degree is further increased by increasing the foam flow speed, and meanwhile blockage caused by medium residues in the foam-liquid mixer is avoided; a screen arranged in a mixing cavity of the foam-liquid mixer is used for promoting the foam and the gel solution to be further uniformly mixed.

Description

Technical Field

[0001] The utility model relates to the field of foam fire extinguishing devices, in particular to a foam-liquid mixed gel foam generator. Background Art

[0002] Gel foam is a highly stable foam based on a cross-linking reaction between a gelling agent and a cross-linking agent. Different from single-component high-expansion, medium-expansion, and low-expansion foam fire extinguishing agents, gel foam is produced by mixing a two-component system solution of A and B with air, where component A mainly includes a foaming agent, a cross-linking agent, etc., and component B is a gelling agent solution. During the foaming process, the gelling agent and the cross-linking agent are fully mixed, and a strong, non-breakable three-dimensional network structure polymer gel is formed through cross-linking, thereby enhancing the liquid film strength and foam viscosity of the gel foam. Due to the long liquid separation time and high foam viscosity, gel foam has the advantages of high water retention, good adhesion, strong coverage and excellent thermal stability. When applied to the surface of flammable liquids, buildings and other combustible materials, it can effectively inhibit liquid volatilization and prevent combustible materials from catching fire or reigniting.

[0003] CN 113750413A, CN 117225223A, CN 117442908A, CN 117797427A, CN 216091970U, and other methods employ a "liquid-liquid-gas-liquid" mixing method, mixing component A and B solutions to form a two-component foam system solution. Gas is then introduced through a foam generator to promote mixing of the solution and air, producing gel foam. However, for highly viscous gelling solutions such as guar gum, cellulose, and polyacrylamide (viscosity no less than 3000 cp at 60 rpm using a No. 3 rotor), these solutions suffer from problems such as uneven liquid-liquid and gas-liquid mixing, resulting in discontinuous gel foam jetting and a low foaming multiple (less than 6 times).

[0004] CN 103570375A, CN 105344040A, CN 117982830A, and others, etc., add a gelling agent to form gel foam after foam is formed. Specifically, the method involves using a foaming gelator to mix a foam solution with gas to form foam, and then injecting a gelling agent into the foaming gelator to mix with the foam to form a foam gel. However, this device is used in coal mine goafs and is not suitable for foam firefighting equipment such as foam fire trucks and foam fire extinguishing systems. Therefore, it is necessary to design a gel foam generator suitable for existing foam fire extinguishing system equipment that can continuously produce high-performance gel foam.

[0005] For this reason, it is necessary to provide a bubble-liquid mixed gel foam generator. Utility Model Content

[0006] The purpose of the utility model is to provide a bubble-liquid mixed gel foam generator, which does not require changing the design of the existing compressed gas foam fire extinguishing device, reduces the system modification cost, and is easy to use in combination with the existing device. It is suitable for the existing compressed air foam generating device to cooperate with the generation of gel foam, and can also be used for new gel foam generating devices.

[0007] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions: a bubble-liquid mixing gel foam generator, including a top cover, a shell, a water mist nozzle, and a screen; the shell is divided into a feed chamber and a mixing chamber that are connected to each other, and the structure is distributed in a contracting cone shape from the feed chamber to the mixing chamber. The shell is threadedly installed at the inlet end of the feed chamber, and the water mist nozzle is installed at the inner center of the top cover. The water mist nozzle is connected to the liquid inlet outside the top cover. The feed chamber has multiple foam inlets evenly distributed along its axial direction to form a vertical cross-spray shape in which the spray direction of the water mist nozzle and the jet direction of the foam inlet are perpendicular to each other. Several screens are installed at equal intervals inside the mixing chamber along its axial direction.

[0008] Preferably, the inner diameter of the feeding chamber is 1.2 to 2 times the inner diameter of the mixing chamber.

[0009] Preferably, the inner diameter of the mixing chamber is 1 to 2 times the inner diameter of the gel foam pipeline.

[0010] Preferably, the diameter of the screen is equal to the inner diameter of the mixing chamber.

[0011] Preferably, the number of the screens is not less than two.

[0012] Preferably, the spacing between the screens is 0.8 to 1.5 times the diameter of the screen.

[0013] Preferably, the mesh size of the sieve is selected in the range of 40 meshes to 100 meshes.

[0014] In summary, the present invention provides a bubble-liquid hybrid gel foam generator. Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The utility model uses a bubble-liquid mixing gel foam generator, which injects a gelling agent solution after compressing the gas foam for bubble-liquid mixing, thereby avoiding problems such as uneven liquid-liquid and gas-liquid mixing and difficulty in foaming the solution due to the high viscosity of the gelling agent solution. At the same time, it increases the distribution of the cross-linking agent in the foam liquid film, improves the cross-linking reaction activity of the cross-linking agent and the gelling agent, makes the cross-linking reaction more sufficient, and forms a more uniform gel foam.

[0016] 2. The utility model adopts a bubble-liquid mixer to achieve sufficient mixing of compressed gas foam and gel solution, wherein the water mist nozzle arranged in the feed chamber improves the dispersion degree and injection speed of the gel solution; the nozzle injection direction and the foam inlet jet direction are in a vertical cross-injection pattern, which increases the collision mixing degree of the foam and the gel solution; the bubble-liquid mixer feed chamber and the mixing chamber are connected in a contracting cone, which further increases the mixing degree by increasing the foam flow rate, while avoiding the medium remaining in the bubble-liquid mixer and causing blockage; the screen arranged in the mixing chamber of the bubble-liquid mixer promotes further uniform mixing of the foam and the gel solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the gel foam generator of the present utility model;

[0018] In the figure, 1-top cover, 2-shell, 21-feeding chamber, 22-mixing chamber, 3-water mist nozzle, 4-screen, 5-liquid inlet, 6-foam inlet. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, the utility model is a bubble-liquid mixing gel foam generator, and the specific technical solution is as follows: it includes a top cover 1, a shell 2, a water mist nozzle 3, and a screen 4; the shell 2 is divided into a feed chamber 21 and a mixing chamber 22 that are connected to each other, and the structure is distributed in a contracting cone shape from the feed chamber 21 to the mixing chamber 22. The shell 2 is threadedly installed on the inlet end of the feed chamber 21, and the water mist nozzle 3 is installed at the inner center of the top cover 1. The water mist nozzle 3 is connected to the liquid inlet 5 outside the top cover 1. The feed chamber 21 is evenly distributed with multiple foam inlets 6 along its axial direction to form a vertical cross-spray shape in which the spray direction of the water mist nozzle 3 and the jet direction of the foam inlet 6 are perpendicular to each other. The interior of the mixing chamber 22 is evenly spaced along its axial direction.

[0021] In at least one embodiment, the inner diameter of the feed chamber 21 is 1.2 to 2 times the inner diameter of the mixing chamber 22 .

[0022] In at least one embodiment, the inner diameter of the mixing chamber 22 is 1 to 2 times the inner diameter of the gel foam pipeline.

[0023] In at least one embodiment, the diameter of the screen 4 is equal to the inner diameter of the mixing chamber 22 .

[0024] In at least one embodiment, the number of the screens 4 is no less than two.

[0025] In at least one embodiment, the spacing between the screens 4 is 0.8 to 1.5 times the diameter of the screen 4 .

[0026] In at least one embodiment, the mesh size of the sieve is selected in the range of 40 meshes to 100 meshes.

[0027] The gel foam generator of the present invention is used to generate gel foam, and the steps are as follows:

[0028] Production process: A component system solution containing a cross-linking agent, a foaming agent, etc. is passed through a compressed gas generating device to form compressed gas foam, and the foam is injected into the bubble-liquid mixer through a plurality of pipelines via a foam inlet 6; at the same time, a component system solution containing a gelling agent is injected into the bubble-liquid mixer via a liquid inlet 5; the gelling agent solution is passed through a water mist nozzle 3 and the foam is collided and mixed in a feed chamber 21, and finally passed through a screen 4 for thorough mixing to form a gel foam.

[0029] Foam performance testing process: The flow rate of the Component A solution was 5.7 L / min, and the flow rate of the Component B solution was 5.7 L / min. The air flow test conditions are shown in Table 1. Referring to GB 15308 "Foam Fire Extinguishing Agents," the gel foam expansion ratio and 25% liquid extraction time were tested and recorded. During the 25% liquid extraction time test, if the liquid extraction mass was less than 25% at 48 hours, the timer was stopped and the 25% liquid extraction time was recorded as >48 hours.

[0030] Table 1 Gel foam performance test results

[0031] Air flow Foam temperature Foaming multiple 25% drainage time 48L / min 18℃ 5 ＞48h 80L / min 18.5℃ 8 ＞48h 96L / min 19 10 ＞48h

[0032] Fire extinguishing performance test process: A component system solution flow rate is 5.7L / min, B component system solution flow rate is 5.7L / min, air flow rate is 85L / min, under this condition, gel foam is generated, foam temperature and foam performance are tested and recorded. 2 Rubber industry solvent oil and 1.73m 2 Acetone fire extinguishing tests were conducted using both strong and slow release methods. After a 3-minute pause, a 5-liter fuel burn canister was placed in the center of the oil pan and ignited. The 25% burn time of the gel foam was observed and recorded. The test results are shown in the table below. At 90 minutes into the burn test, if the foam layer in the oil pan remained largely intact and the fuel area was well below 25%, the timer was stopped and the 25% burn time was recorded as >90 minutes.

[0033] Table 2 Gel foam fire extinguishing performance test results

[0034]

[0035]

[0036] The embodiments of the present invention are only used to illustrate the present invention and do not limit the scope of the claims. Other substantially equivalent alternatives that can be thought of by those skilled in the art are all within the protection scope of the present invention.

Claims

1. A bubble-liquid mixed gel foam generator, characterized in that: The invention comprises a top cover (1), a shell (2), a water mist nozzle (3), and a screen (4); the shell (2) is divided into a feed chamber (21) and a mixing chamber (22) which are connected to each other, and the feed chamber (21) is distributed in a conical shape from the feed chamber (21) to the mixing chamber (22); the shell (2) is threadedly mounted on the inlet end of the feed chamber (21); the water mist nozzle (3) is mounted at the inner center of the top cover (1); the water mist nozzle (3) is connected to the liquid inlet (5) outside the top cover (1); a plurality of foam inlets (6) are evenly distributed along the axial direction of the feed chamber (21) to form a vertical cross-spraying shape in which the spray direction of the water mist nozzle (3) and the jet direction of the foam inlet (6) are perpendicular to each other; a plurality of screens (4) are evenly spaced and mounted inside the mixing chamber (22) along the axial direction thereof.

2. The bubble-liquid mixed gel foam generator according to claim 1, characterized in that: The inner diameter of the feeding chamber (21) is 1.2 to 2 times the inner diameter of the mixing chamber (22).

3. The bubble-liquid mixed gel foam generator according to claim 1, characterized in that: The inner diameter of the mixing chamber (22) is 1 to 2 times the inner diameter of the gel foam pipeline.

4. The bubble-liquid mixed gel foam generator according to claim 1, characterized in that: The diameter of the screen (4) is equal to the inner diameter of the mixing chamber (22).

5. The bubble-liquid mixed gel foam generator according to claim 1, characterized in that: The number of the screens (4) is no less than two.

6. The bubble-liquid mixed gel foam generator according to claim 1, characterized in that: The spacing dimension of the screen (4) is 0.8 to 1.5 times the diameter dimension of the screen (4).

7. The bubble-liquid mixed gel foam generator according to claim 1, characterized in that: The mesh size of the sieve (4) is selected in the range of 40 meshes to 100 meshes.

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