Positive and negative pressure coupling foam injection device

Abstract

The invention discloses a positive and negative pressure coupling foam spraying device, which comprises a liquid suction pipe, an air injection hole, a gas-liquid mixing pipe, a primary spoiler, a secondary spoiler, a positive pressure foam spraying port, a foam spraying pipe and a tertiary Spoiler; wherein, the diameter of the gas-liquid mixing tube is smaller than the diameter of the foam spray tube; the suction tube is connected to the rear end of the gas-liquid mixing tube; the gas injection hole is arranged on the circumferential side wall at the rear of the gas-liquid mixing tube; the primary turbulence Both the device and the secondary spoiler are installed in the gas-liquid mixing pipe; the positive pressure foam injection port is connected to the front end of the gas-liquid mixing pipe, and extends forward into the foam injection pipe; the rear end of the foam injection pipe is uniformly provided with suction holes ;Three spoilers are installed in the foam injection pipe. The present invention realizes large-flow spraying of positive-pressure foam with low gas consumption, saving the gas consumption of positive-pressure foam system; the present invention realizes that the foam mixture has good foam performance when sprayed under large-flow conditions, Improved foam performance for negative pressure foam systems.

Description

technical field [0001] The invention belongs to the field of foam fire extinguishing, and in particular relates to a positive and negative pressure coupling foam injection device, which is suitable for oil depots, gas stations, petrochemical enterprises and other places. Background technique [0002] At present, most of the fire extinguishing in Class B fire places uses the air-breathing foam fire extinguishing system. The foam fire extinguishing system belongs to the negative pressure foam system. The fire extinguishing effect is not high, especially when the foam is sprayed at a large flow rate, the sprayed foam cannot be completely foamed by air suction, resulting in poor foam effect; before adopting the positive pressure foam fire extinguishing system, high-pressure gas is forced into the foam mixture for forced Foaming, the formed foam is stable, the bubbles are uniform, and the fire extinguishing effect is good. For the positive pressure foam system, when the flow rat...

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Problems solved by technology

[0002] At present, most of the fire extinguishing in Class B fire places uses the air-breathing foam fire extinguishing system. The foam fire extinguishing system belongs to the negative pressure foam system. The fire extinguishing effect is not high, especially when the foam is sprayed at a large flow rate, the sprayed foam cannot be completely foamed by air suction, resulting in poor foam effect; before adopting the positive pressure foam fire extinguishing system, high-pressure gas is forced into the foam mixture for forced Foaming, the formed foam is stable, the bubbles are uniform, and the fire extinguishing effect is good

For the positive pressure foam system, when the flow rate of the foam system increases, the amount of gas consumed also increases accordingly. Affected by the gas supply rate, the flow rate of the positive pressure foam system is often limited to a certain extent, and it cannot achieve large For flow injection, the flow rate of the general positive pressure foam system is 3000-5000L / min, while the foam flow rate required for large oil tank fire extinguishing is often above 8000-10000L / min. The positive pressure foam system cannot be applied to large-scale fire fighting. Limits the range of applications for positive pressure foam systems

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