A foam generating device

Abstract

The utility model discloses a kind of foam generating devices, comprising: foam generator;One foam barrel, the cylindrical barrel of both ends opening, one end is fixedly connected with foam generator outlet end through web;Two groups of foaming nets, are the cylindrical trapezoidal foaming net of large end opening, and large end of opening is same with foam barrel inner diameter;Two groups of foaming nets are fixed in foam barrel inner wall by bolt interval before and after;Each cylindrical trapezoidal foaming net cover surface is evenly densely covered with foaming hole.The utility model device improves cyclone plate and foaming net structure, need not strong wind foaming, foam mixed solution mixes fully, after being sprayed from nozzle, air is driven under high-speed liquid flow to form negative pressure zone, inhale air into mixed solution constantly, again evenly jet on a pair of foaming net, let foam mixed solution foam, diffuse;Device can efficiently form middle multiple foam to spray, also can switch use its function, have better fire extinguishing effect and isolation ability, reduce burning material concentration more effectively.

Description

Technical Field

[0001] This utility model belongs to the field of fire protection equipment design technology, and in particular to the field of foam fire extinguishing equipment design technology, specifically relating to a foam generating device. Background Technology

[0002] Foam generators are mainly used in fire extinguishing and firefighting. Their working principle involves introducing air into a foaming agent solution to form a mixture. The foaming agent solution is the dispersion medium, and the gas is the dispersed phase. The gas disperses in the liquid, forming bubbles, and these numerous bubbles then combine to form foam. Existing foam generators use airflow generated by fan blades to propel the mixture against a metal foaming mesh for foaming. However, the mixture is often unevenly mixed before foaming, and the current products eject the mixture in a columnar shape, which is not conducive to the bonding of the foam mixture with air, resulting in low foaming efficiency.

[0003] Most foam generators on the market currently use single-fan foaming nets, which make it difficult to fully mix the foam mixture with air during use, resulting in less foam and more water droplets.

[0004] Medium expansion foam refers to fire extinguishing foam with an expansion ratio between 20 and 200. Existing medium expansion foam generators suffer from low kinetic energy and short range, leading to unsatisfactory extinguishing effects when used in large-scale fires. Furthermore, some foam generators still employ traditional wind turbine foaming designs, which are easily affected by airflow, making it difficult to accurately project foam to the fire location. Summary of the Invention

[0005] This invention discloses a foam generating device to address the shortcomings of existing technologies. The purpose of this invention is to provide a foam generating device with a high expansion ratio that utilizes hydraulic power for foaming.

[0006] This utility model is achieved through the following technical solution:

[0007] A foam generating apparatus, comprising a foam generator, characterized in that it further comprises:

[0008] A foam tube is a cylindrical tube open at both ends, with one end connected and fixed to the outlet end of the foam generator via a rib plate;

[0009] Two sets of foaming nets, both cylindrical trapezoidal foaming nets with open ends, the large end of the opening being the same as the inner diameter of the foam tube; the two sets of foaming nets are fixed to the inner wall of the foam tube with bolts at intervals; each cylindrical trapezoidal foaming net has uniformly densely distributed foaming holes on its surface.

[0010] Furthermore, one end of the foam cylinder is connected and supported by three or four sets of inclined stiffeners to a fixing ring fitted around the outer periphery of the foam generator outlet; the foam generator outlet is located on the outer side of the foam cylinder inlet end.

[0011] The foam generator described in this invention is a foam generating device with a Venturi structure.

[0012] Furthermore, the foam tube has a handle for holding on the upper part of its outer wall and a fixed stand for placing on the lower part.

[0013] Furthermore, the outlet end of the foam generating device is provided with a swirl plate for forming a swirling jet of foam liquid.

[0014] Furthermore, the liquid inlet end of the foam generator is provided with a quick-connect adapter for connecting a water pipe.

[0015] This novel foam generating device improves upon the structure of the swirl plate and foaming net, resulting in superior fire extinguishing and isolation capabilities. It is more effective at reducing the concentration of burning materials by preventing air and flammable liquids from entering the combustion zone. It can also slow down the rate of chemical reactions in the burning material and lower the temperature of the combustion zone until it reaches a temperature at which the burning material cannot burn, i.e., the temperature at which combustion extinguishes. Compared to traditional fire extinguishing equipment, the extinguishing time can be significantly shortened.

[0016] This novel foam generating device eliminates the need for strong airflow. When the foam mixture impacts the swirl plate, it generates turbulence, ensuring thorough mixing before being ejected from the nozzle. The surrounding air, driven by the high-speed liquid flow, forms a negative pressure zone, continuously drawing air into the mixture. This air is then evenly sprayed onto a pair of foaming nets, causing the foam mixture to foam and diffuse, thus uniformly mixing the air with the foam mixture to form the ejected foam.

[0017] This utility model of a medium-expansion foam generating device consists of a foam generator barrel and a multi-functional water gun, which can efficiently generate and spray medium-expansion foam, and can also switch its function according to the actual fire situation.

[0018] This utility model's medium-expansion foam generating device is mostly made of stainless steel, making it lightweight. It features a handle and hose connection, and its elegant appearance allows for easy handheld operation, reducing the workload for firefighters. It can be used with foam fire trucks, water tanker fire trucks, and portable motorized fire pumps, along with a pipeline proportioning mixer, to generate medium-expansion foam suitable for extinguishing petroleum product fires and solid material fires. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the foam generating device of this utility model.

[0020] Figure 2This is a schematic diagram of the structure of the foam generating device of this utility model.

[0021] In the diagram, a is a foam cylinder, b is a foaming net, and c is a foam generating device. 1 is a bolt, 2 is a retaining ring, 3 is a stiffening plate, 4 is a hose connector, 5 is a conversion connector, 6 is a suction chamber, 7 is a suction tube base, 8 is a union nut, 9 is a pagoda outlet, 10 is a friction washer, 11 is a suction tube, 12 is a nozzle, 13 is a hose, 14 is the first foaming net, 15 is the second foaming net, 16 is a handle, 17 is a fixed bracket, and 18 is a swirl plate. Specific Implementation

[0022] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principle of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the protection scope of the present invention.

[0023] Refer to the attached diagram.

[0024] As shown in the figure, the foam generator device of this utility model includes: a foam cylinder, b foaming net, and c foam generating device.

[0025] As shown in the figure, the foaming net b is fixed to the foaming cylinder a by bolt 1. The two sets of foaming nets a are installed at a height above the foam submersion depth, close to the protected area but not outside the protected area. The foaming cylinder a also has a handle 16 and a fixed foot 17 fixed on it. The foam gun c is fixed to the foaming cylinder a by a fixing ring 2 and a stiffener 3. The water hose 13 is fixed to the adapter 5 by a water hose interface 4. The adapter 5 is threaded to the suction chamber 6. The suction tube base 7, the union nut 8, the pagoda outlet 9, and the friction washer 10 are connected in sequence to connect the suction tube 11 to the suction chamber 6. The outlet of the suction chamber 6 is fixed to the nozzle 12. At the same time, a swirl plate 18 is fixed inside the nozzle 12. The nozzle 7 is fixed to the fixing ring 2, completing the assembly of the foam generator device.

[0026] When the foam generator is working, the water hose 13 is connected to the foam gun c through the water hose interface 4, and the water flows smoothly into the suction chamber 6. Utilizing the Venturi principle, when the water flows through the suction chamber 6, a negative pressure is formed, causing the foam liquid to flow through the suction tube and enter the suction chamber to mix with the water. When the mixed liquid flows through the swirl plate 18, the specific angle and slit of the swirl plate 18 will cause the mixed liquid to generate a high-speed rotating vortex. These vortices will cause the mixed liquid to be mixed violently and thoroughly, and finally sprayed rapidly through the nozzle 12.

[0027] The rapidly sprayed mixture hits the first foaming net 14 inside the foam cylinder a. When the mixture passes through the first foaming net 14, the holes in the foaming net cause the mixture to generate a large amount of foam. Then, it passes through the second foaming net 15, which multiplies the foam and can efficiently generate medium-expansion foam, so as to quickly cover the fire extinguishing area and isolate it from the air.

Claims

1. A foam generating device, comprising a foam generator, characterized in that... Also includes: A foam tube is a cylindrical tube open at both ends, with one end connected and fixed to the outlet end of the foam generator via a rib plate; two sets of foaming nets are both cylindrical trapezoidal foaming nets with the large end open, the large end of the opening being the same as the inner diameter of the foam tube; the two sets of foaming nets are fixed to the inner wall of the foam tube by bolts at intervals; each cylindrical trapezoidal foaming net has uniformly densely distributed foaming holes on its surface.

2. The foam generating device according to claim 1, characterized in that: One end of the foam cylinder is connected and supported by three or four sets of inclined stiffeners to a fixing ring fitted around the outer periphery of the foam generator outlet; the foam generator outlet is located on the outer side of the foam cylinder inlet.

3. The foam generating device according to claim 1 or 2, characterized in that: The foam generator is a foam generating device with a Venturi structure.

4. The foam generating device according to claim 3, characterized in that: The foam tube has a handle for holding on the upper part of its outer wall and a fixed stand for placing on the lower part.

5. The foam generating device according to claim 3, characterized in that: The outlet end of the foam generating device is equipped with a swirl plate for forming a swirling jet of foam liquid.

6. The foam generating device according to claim 3, characterized in that: The foam generator is equipped with a quick-connect fitting at the liquid inlet for connecting to a water pipe.

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