Fire-fighting foam foaming device and method

Abstract

The invention discloses a fire-fighting foam foaming device and method. The fire-fighting foam foaming device comprises a stirring and mixing pipeline, a flow regulating valve, a foaming and mixing pipeline and a foam emitting pipeline which are communicated in sequence; a mixed liquid stirring device is arranged in an inner cavity of the stirring and mixing pipeline; a compressed air inlet pipeline is arranged on the foaming mixing pipeline, and the outlet end of the compressed air inlet pipeline extends into a cavity of the foaming mixing pipeline and faces an inner cavity of the foam emitting pipeline; and a foam generating device is arranged in an inner cavity of the foam emitting pipeline.

Description

Technical Field

[0001] This invention belongs to the field of fire protection equipment technology, and specifically relates to a fire-fighting foam generating device and method. Background Technology

[0002] When a fire occurs, there are usually several methods of extinguishing it, including water, dry powder, Class A and Class B foam, and inert gas. Water acts as a coolant during the extinguishing process, while dry powder and inert gas extinguish by isolating the air. Foam, however, combines both cooling and air isolation, making it the most efficient extinguishing method available. A compressed air foam system is the equipment that produces foam. A compressed air foam system is a device that mixes water and foam, then mixes it with compressed air to create foam. The foam, water, and air mixture is then piped to a foam gun or foam cannon outlet for spraying. The system consists of a water pump, a foam pump, an air compressor, a foam proportioning controller, and a foam mixing device. The foam mixing device is crucial for foam quality. Currently, most foam mixing devices simply mix foam, water, and compressed air, or add a foaming device (similar to a grid-like foaming device) after mixing, or use a foaming structure with multiple fine round holes.

[0003] These existing technologies have significant technical shortcomings: Firstly, water and foam are mixed with compressed air before proper mixing, failing to form high-quality foam and thus unable to effectively cover the fire source, failing to fully utilize the coverage and cooling properties of the compressed air foam system. Secondly, the dispersed components (such as independent water pumps, foam pumps, mixers, and foaming nets) result in complex piping layouts and significant pressure losses. Finally, traditional foaming devices (such as metal mesh) have high flow resistance, leading to insufficient foaming and poor foam quality (such as expansion ratio and liquid separation time), ultimately affecting fire extinguishing efficiency (coverage and cooling performance). All of these factors severely hinder the use and promotion of compressed air foam systems. Therefore, there is an urgent need to develop an integrated fire-fighting foaming device that achieves efficient mixing, low pressure loss, and high foaming quality. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a fire-fighting foam generating device and method.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows: The fire-fighting foam generating device includes a mixing pipe (2), a flow regulating valve (3), a foaming mixing pipe (4), and a foam generating pipe (6) connected in sequence; the mixing pipe (2) is equipped with a mixing device (1) for mixing liquid; the foaming mixing pipe (4) is equipped with a compressed air inlet pipe (8), the outlet end of the compressed air inlet pipe (8) extends into the cavity of the foaming mixing pipe (4) and faces the cavity of the foam generating pipe (6); the cavity of the foam generating pipe (6) is equipped with a foam generating device (5).

[0006] Preferably, the mixing device (1) includes a rotating shaft along the pipeline direction, a spiral blade disposed on the rotating shaft, and a rotating shaft support.

[0007] Preferably, the flow regulating valve (3) is an electric valve.

[0008] Preferably, the inlet end of the compressed air inlet pipe (8) is provided with a compressed air inlet check valve (7).

[0009] Preferably, the foam generating device (5) includes a foaming plate support frame fixed in the inner cavity of the foam generating pipe (6) and at least one honeycomb foaming plate (51) disposed on the foaming plate support frame.

[0010] More preferably, the honeycomb foam board (51) has multiple hexagonal honeycomb units stacked together.

[0011] Preferably, the foam board support frame includes at least one blade frame (52), a main support frame shaft (53) connected to the center of the blade frame (52), and a secondary support frame shaft (54) connected to the periphery of the blade frame (52).

[0012] More preferably, the number of honeycomb foam boards (51) is 2, and the number of blade frames (52) is 2.

[0013] More preferably, the number of blade holders (52) is 5.

[0014] The present invention also provides a foaming method based on the above-mentioned fire-fighting foam foaming device, the method comprising the following steps: (1) Push water and foam liquid into the mixing pipe. The water and foam liquid are fully mixed under the action of the mixing device to form a mixture. (2) After the flow rate of the mixture is adjusted by the flow regulating valve, it is pushed into the foaming mixing pipe. At the same time, compressed air with the same flow direction as the mixture is injected into the foaming mixing pipe. The mixture and compressed air are mixed in the foaming mixing pipe to form a mixture. (3) The mixture is pushed into the foam generating device to generate high-expansion compressed air foam and then pushed out.

[0015] The present invention will be further described below: The fire-fighting foam generating device of this invention includes a mixing pipe, a flow regulating valve, a foaming mixing pipe, and a foam dispensing pipe connected sequentially along the fluid flow direction. The mixing pipe contains a mixing device to thoroughly mix water and foam liquid; the flow regulating valve regulates the flow rate of the mixture to control the wetness of the foam; the foaming mixing pipe mixes the mixture with compressed air; and the foam dispensing pipe contains a foam generating device for foaming. The core of the foam generating device is a honeycomb foaming plate composed of stacked hexagonal honeycomb units. This design allows for a large compressed air foam flow area and minimal flow loss, resulting in better foaming performance. As a preferred embodiment, this invention uses a two-stage foaming plate to ensure more complete foaming. This invention integrates mixing, flow regulation, compressed air injection, and the foaming device into a single component, making the entire system more streamlined.

[0016] The foaming method of this invention is as follows: first, water and foam liquid are thoroughly mixed using a mixing device; then, the flow rate of the foam mixture is adjusted by an electric valve to form a dry-wet foam gas-liquid ratio; next, compressed air is injected, with the injection point located in the middle of the pipeline of the entire component, so that the compressed air can evenly fill the entire pipeline, and the injection direction is the same as the flow direction of the mixture to reduce pressure loss after mixing; finally, after the compressed air and mixture are mixed by the foaming device, a high-expansion CAFS is output.

[0017] Existing technologies inject water, foam, and compressed air into a single mixing chamber for foaming, without special treatment for the mixing of water and foam solution, resulting in poor foaming effect. This invention segments the entire foaming process, adding a stirring treatment to the mixing of water and foam solution to ensure thorough mixing of the foam mixture. Existing technologies fail to integrate the foam mixture stirring device, electric flow regulating valve, compressed air injection, and foaming device into a single component, instead dispersing them, leading to complex water circuit layout and significant outlet pressure loss. This invention integrates multiple functions into a single component, including foam mixture stirring, dry / wet foam adjustment, non-destructive compressed air injection, and dual foaming, making installation convenient. Existing technologies use stainless steel mesh, small perforated plates, or pipe baffles for flow through the pipeline, resulting in significant flow loss and inability to achieve thorough mixing of the foam mixture and compressed air, leading to poor foaming effect. This invention uses honeycomb panels for foaming; the seamless stacking of regular hexagons allows for more complete compressed air foaming and a larger foam flow rate.

[0018] In summary, compared with the prior art, the beneficial effects of the present invention are as follows: 1. It increases the foam expansion ratio, which makes the foam have stronger coverage, better foam adhesion, and longer separation time.

[0019] 2. The specially designed foaming device ensures better uniformity of foam mixing, thus improving the fire extinguishing efficiency of the foam system.

[0020] 3. The piping has been simplified, making pipe installation more convenient.

[0021] 4. First, mix the water and foam liquid, and then mix them with compressed air. This clarifies the correct process for foaming a compressed air foam system.

[0022] 5. It integrates multiple functions such as water and foam mixing, dry and wet foam adjustment, and compressed air injection.

[0023] In summary, this invention improves the foaming effect of compressed foam systems and enhances the fire extinguishing performance of compressed air foam systems. In fire extinguishing applications, it reduces extinguishing time and fire losses. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of a foam generating device.

[0025] In the diagram: 1. Mixing device; 2. Mixing pipe; 3. Flow regulating valve; 4. Foaming pipe; 5. Foam generating device; 6. Foam discharging pipe; 7. Compressed air inlet check valve; 51. Foaming plate; 52. Blade holder; 53. Main support frame shaft; 54. Secondary support frame shaft. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] See Figure 1 and Figure 2 The fire-fighting foam generating device includes a mixing pipe 2, a flow regulating valve 3, a foaming mixing pipe 4, and a foam generating pipe 6 connected in sequence; the mixing pipe 2 is equipped with a mixing device 1; the foaming mixing pipe 4 is equipped with a compressed air inlet pipe 8, the outlet end of the compressed air inlet pipe 8 extends into the cavity of the foaming mixing pipe 4 and faces the inner cavity of the foam generating pipe 6; the inner cavity of the foam generating pipe 6 is equipped with a foam generating device 5.

[0029] The mixing device 1 includes a rotating shaft along the pipeline direction, spiral blades mounted on the rotating shaft, and a rotating shaft support. The flow regulating valve 3 is an electric valve. The inlet end of the compressed air inlet pipeline 8 is equipped with a compressed air inlet check valve 7. The foam generating device 5 includes a foaming plate support frame fixed inside the foam generating pipeline 6 and two honeycomb-shaped foaming plates 51 mounted on the foaming plate support frame. The honeycomb structure of the honeycomb-shaped foaming plate 51 consists of multiple stacked regular hexagonal honeycomb units. The foaming plate support frame includes five blade frames 52, a main support frame shaft 53 connected to the center of the blade frames 52, and a secondary support frame shaft 54 ​​connected to the periphery of the blade frames 52.

[0030] Example 2 A foaming method based on the fire-fighting foam foaming device described in Embodiment 1 includes the following steps: (1) Push water and foam liquid into the mixing pipe. The water and foam liquid are fully mixed under the action of the mixing device to form a mixture. (2) After the flow rate of the mixture is adjusted by the flow regulating valve, it is pushed into the foaming mixing pipe. At the same time, compressed air with the same flow direction as the mixture is injected into the foaming mixing pipe. The mixture and compressed air are mixed in the foaming mixing pipe to form a mixture. (3) The mixture is pushed into the foam generating device to generate high-expansion compressed air foam and then pushed out.

[0031] Example 3 In a fire-fighting foam spraying experiment, the fire-fighting foam foaming device described in this invention was used to foam the foam. The foaming ratio was increased from 10 times to 18 times, and the foam range was increased from 15 meters to 20 meters. This not only improved the foam effect but also increased the foam range, greatly improving the fire extinguishing efficiency of the compressed air foam system.

Claims

1. A fire-fighting foam dispensing apparatus characterised in that, The fire-fighting foam foaming device comprises a stirring and mixing pipeline (2), a flow regulating valve (3), a foaming and mixing pipeline (4) and a foam outlet pipeline (6) connected in sequence; the stirring and mixing pipeline (2) is provided with a mixed liquid stirring device (1) in the inner cavity; the foaming and mixing pipeline (4) is provided with a compressed air inlet pipeline (8), the outlet end of the compressed air inlet pipeline (8) extends into the cavity of the foaming and mixing pipeline (4) and faces the inner cavity of the foam outlet pipeline (6); the foam outlet pipeline (6) is provided with a foam generating device (5) in the inner cavity.

2. A fire fighting foam dispensing apparatus as claimed in claim 1 wherein, The mixed liquid stirring device (1) comprises a rotating shaft along the pipeline direction, a spiral blade arranged on the rotating shaft and a rotating shaft support.

3. The fire-fighting foam dispensing apparatus of claim 1, wherein, The flow regulating valve (3) is an electric valve.

4. The fire-fighting foam dispensing apparatus of claim 1, wherein, The inlet end of the compressed air inlet pipeline (8) is provided with a compressed air inlet one-way valve (7).

5. The fire-fighting foam dispensing apparatus of claim 1, wherein, The foam generating device (5) comprises a foaming plate support framework fixed in the inner cavity of the foam outlet pipeline (6) and at least one honeycomb foaming plate (51) arranged on the foaming plate support framework.

6. A fire-fighting foam dispensing apparatus as claimed in claim 5, wherein, The honeycomb of the honeycomb foaming plate (51) is a plurality of regular hexagonal honeycomb units stacked.

7. The fire-fighting foam dispensing apparatus of claim 5, wherein, The foaming plate support framework comprises at least one blade holder (52), a main support framework shaft (53) connected with the center of the blade holder (52) and a secondary support framework shaft (54) connected with the periphery of the blade holder (52).

8. A fire fighting foam dispensing apparatus as claimed in claim 7 wherein, The number of the honeycomb foaming plates (51) is 2, and the number of the blade holders (52) is 2.

9. A fire fighting foam dispensing apparatus as claimed in claim 8 wherein, The number of the blade holders (52) is 5.

10. Foam generation method based on the foam generation device according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: (1) pushing water and foam liquid into the stirring and mixing pipeline, and mixing the water and the foam liquid under the action of the mixed liquid stirring device to form a mixed liquid; (2) pushing the mixed liquid into the foaming and mixing pipeline after adjusting the flow by the flow regulating valve, and injecting compressed air into the foaming and mixing pipeline at the same flow direction as the mixed liquid, mixing the mixed liquid and the compressed air in the foaming and mixing pipeline to form a mixture; (3) pushing the mixture into the foam generating device for foaming, and pushing out after generating high-multiple compressed air foam.

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