A fire-fighting foam dispensing apparatus

Abstract

The utility model discloses a fire-fighting foam foaming device. The fire-fighting foam foaming device includes the stirring mixed pipeline, the flow regulating valve, the foaming mixed pipeline and the foam outlet pipeline that communicate in proper order, the stirring mixed pipeline inner chamber is equipped with the mixed liquid stirring device, is equipped with the compressed air inlet pipeline on the foaming mixed pipeline, the outlet end of compressed air inlet pipeline stretches into the chamber of foaming mixed pipeline and is towards the foam outlet pipeline inner chamber, the foam outlet pipeline inner chamber is equipped with the foam generating device.

Description

Technical Field

[0001] This utility model belongs to the field of fire protection equipment technology, and specifically relates to a fire-fighting foam generating device. 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. Utility Model Content

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

[0005] To achieve the above objectives, the technical solution provided by this utility model 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 foaming method of the above-mentioned fire-fighting foam foaming device 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.

[0015] The present invention will be further described below: The fire-fighting foam generating device of this utility model 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 utility model uses a two-stage foaming plate to ensure more complete foaming. This utility model 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 based on this utility model 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, reducing the 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 liquid, resulting in poor foaming effect. This invention segments the entire foaming process, adding a stirring treatment to the mixing of water and foam liquid 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 this utility model 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 this utility model; 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 present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[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

[0032] In a fire-fighting foam spraying experiment, the fire-fighting foam foaming device described in this utility model was used for foaming. 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 generating device, characterized in that, 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).

2. The fire-fighting foam generating device as described in claim 1, characterized in that, 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.

3. The fire-fighting foam generating device as described in claim 1, characterized in that, The flow regulating valve (3) is an electric valve.

4. The fire-fighting foam generating device as described in claim 1, characterized in that, The inlet end of the compressed air inlet pipe (8) is provided with a compressed air inlet check valve (7).

5. The fire-fighting foam generating device as described in claim 1, characterized in that, The foam generating device (5) includes a foaming plate support frame fixed in the inner cavity of the foam emitting pipe (6) and at least one honeycomb foaming plate (51) disposed on the foaming plate support frame.

6. The fire-fighting foam generating device as described in claim 5, characterized in that, The honeycomb foam board (51) has multiple regular hexagonal honeycomb units stacked together.

7. The fire-fighting foam generating device as described in claim 5, characterized in that, 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).

8. The fire-fighting foam generating device as described in claim 7, characterized in that, The number of honeycomb foam boards (51) is 2, and the number of blade frames (52) is 2.

9. The fire-fighting foam generating device as described in claim 8, characterized in that, The number of blade holders (52) is 5.

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