CN212651264U

CN212651264U - Gas-liquid two-phase flow water mist fire extinguishing nozzle

Info

Publication number: CN212651264U
Application number: CN202021344321.0U
Authority: CN
Inventors: 孙伟; 张晨; 史建忠
Original assignee: Research Institute Of Tsinghua Pearl River Delta; Guangzhou Guanghua Acoustic Wave Applied Technology Co ltd
Current assignee: Research Institute Of Tsinghua Pearl River Delta; Guangzhou Guanghua Acoustic Wave Applied Technology Co ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2021-03-05
Anticipated expiration: 2030-07-10

Abstract

A gas-liquid two-phase flow water mist fire extinguishing nozzle comprises a bolt, a nut, a body, a cone, a resonance body, a shell and an upper cover, wherein the resonance body and the cone are connected together through the bolt; the cone and the body are connected into a whole by a nut; the upper end of the body is provided with a gas inlet, the shell is in threaded connection with the body, the upper cover is in threaded connection with the shell and the body, the inner wall of the body is provided with a gas diversion hole, and a horn-shaped cavity is formed by the inner conical surface of the body and the outer conical surface of the cone and is communicated with the gas diversion hole; the lower end of the body is provided with a water diversion slotted hole near the outer diameter, the side walls of the shell and the body are provided with water flow connectors, the water flow connector holes are communicated with the water diversion slotted hole, and a gap between the body and the resonance body forms a fine water mist spray outlet. The invention can instantly atomize the water and quickly fill the whole protection space due to the gas-liquid two-phase flow design, thereby achieving the effect of full flooding of the fire extinguishing range and improving the fire extinguishing efficiency.

Description

Gas-liquid two-phase flow water mist fire extinguishing nozzle

Technical Field

The utility model belongs to the technical field of extinguishing device, in particular to gas-liquid two-phase flow water mist fire extinguishing nozzle.

Background

Since the haloalkane fire extinguishing agent is prohibited from being used in the global range from 2012, the haloalkane fire extinguishing agent is damaged by the ozone layer, so that a new generation of fire extinguishing agent substitute with cleanness, high efficiency, safety and stability is urgently needed to be searched. The fire extinguishing agents such as aerosol, ultrafine dry powder, heptafluoropropane and perfluorohexanone have many defects in fire fighting engineering application in the industrial field due to the corrosivity of the agents, high cost, large difficulty in cleaning and recovering after fire extinguishing and the like. With the continuous investment of the 5G base station, the new energy automobile, the new energy charging pile and the big data center, which are provided with a large number of lithium ion batteries with high specific energy and high fire hazard, the 5G base station, the new energy automobile, the high-power new energy charging pile and the big data center which are operated for a long time become a great potential safety hazard. In the fields, the selection of the environment-friendly, safe and high-efficiency fire extinguishing agent without electrical damage is an important guarantee for ensuring the fire safety of the fire extinguishing agent.

The water mist fire extinguishing system is a fixed fire extinguishing device which takes water as a medium and adopts a special nozzle to spray water mist under specific working pressure for fire extinguishing, fire suppression and fire control, and the system becomes an ideal substitute of a haloalkane fire extinguishing agent by virtue of the advantages of high fire extinguishing efficiency, wide application range, environmental protection, no electric injury and the like, and plays an increasingly important role in replacing carbon dioxide, heptafluoropropane and other greenhouse gases. However, in the domestic fine water mist fire extinguishing system, the high-pressure and medium-pressure technologies are generally adopted to realize the refinement of the mist drops, and many building types and spaces cannot realize the installation of the fire-fighting water pump room, the fire-fighting water main pipe and the fire-fighting branch pipe of each fire-fighting subarea of the high-pressure and medium-pressure system, so that the application of the fine water mist clean and efficient fire extinguishing technology is greatly restricted. In the fire extinguishing system for realizing the refinement of fog drops by generally adopting high-pressure and medium-pressure technologies in the water mist fire extinguishing system, because many building types and spaces can not realize the installation of a fire pump room, a fire water main pipe and a fire branch pipe of each fire prevention subarea of the high-medium-pressure system, the fire extinguishing efficiency of the clean and efficient fire extinguishing technology of the water mist on the water mist is greatly restricted. Specific defects and deficiencies are as follows:

fine water mist D sprayed from spray head₅₀The particle size is large, and the numerical range is as follows: 150-400 mu m, and the effect of total flooding can not be achieved although a certain impact force exists. (note: total flooding means that the fire extinguishing agent sprayed out fills the entire protected area).

Secondly, very high pressure is needed for spray head atomization, the pressure value range is 1.2MPa-12MPa, engineering implementation has many limitations, and high-pressure water pumps, water pools, purified water, high-pressure stainless steel pipelines and the like are needed.

And thirdly, the nozzle of the spray head has small diameter and high requirement on water quality.

Fourthly, the water consumption is large, and because the average particle size of the water mist is large, the water mist is not gasified completely in a fire scene, so that secondary water damage to protected objects and buildings is caused.

The high-pressure and medium-pressure fine water mist spray head is used for forming fine water mist by means of collision, impact and the like of water at the spray head, the average particle size of the fine water mist is 150-400 mu m, the air suspension capacity is poor, and the total flooding effect is poor.

Disclosure of Invention

The utility model aims to provide a gas-liquid two-phase flow water mist fire extinguishing nozzle for spraying fire extinguishing agent to extinguish fire aiming at the defects of the existing fire extinguishing nozzle.

The technical scheme of the purpose of the utility model is as follows:

a gas-liquid two-phase flow water mist fire extinguishing nozzle comprises a bolt, a nut, a body, a cone, a resonance body, a shell and an upper cover, wherein the resonance body and the cone are connected together through the bolt; the cone and the body are connected into a whole by a nut; the upper end of the body is provided with an air inlet, and a sealing gasket is arranged at the connecting position of the nut in consideration of the impact effect of air flow. The shell is in threaded connection with the body, the upper cover is in threaded connection with the shell and the body, a gas distributing hole is formed in the inner wall of the body, and a horn-shaped cavity is formed by the inner conical surface of the body and the outer conical surface of the cone and is communicated with the gas distributing hole. A water diversion slotted hole is formed in the position, close to the outer diameter, of the lower end of the body, a water flow joint is installed on the side walls of the shell and the body, the water flow joint hole is communicated with the water diversion slotted hole, a sealing ring for preventing water leakage is arranged in a gap between the body and the shell at the upper position and the lower position of the water flow joint hole, and a fine water mist spraying port is formed in a gap between the body and the resonance body.

The utility model discloses a theory of operation does:

the gas enters the water flow joint and flows through the body, is shunted through the gas shunting holes of the body, enters the fire extinguishing nozzle, is secondarily shunted through the cone, and is ejected after being hit on the resonance body.

Secondly, water enters a circular ring formed by the shell and the body, is shunted by the body water shunt slotted hole and is sprayed out from the water mist spray outlet.

And thirdly, the gas and the water (liquid) are not mixed in the fire extinguishing nozzle. After the gas is subjected to secondary uniform shunting, the gas strikes the resonance body to form sound waves with certain frequency, low-pressure pneumatics are generated, and the sprayed water is instantly atomized.

The utility model has the advantages that:

1. compare with other fire extinguishing systems of the same type, because of the utility model discloses gas-liquid two-phase flow design makes spun hydroenergy atomize in the twinkling of an eye, can be full of whole protection space rapidly to reach the effect to putting out a fire the full flooding of scope, improved fire extinguishing efficiency.

2. The utility model discloses it is little to spray water smoke mean particle size, through carrying out the particle size distribution test to gas-liquid two-phase flow water mist spray nozzle spun droplet, under the double-phase different pressure of gas-liquid, the mean particle size scope of the water mist that gas-liquid two-phase flow water mist spray nozzle produced is 50-300 mu m, compare with existing water mist spray nozzle, million times have improved the specific surface area of water mist, instantaneous vaporization when meetting flame, the heat absorption forms steam, both reduced the fire field temperature, the environment of a high-efficient oxygen deficiency has been formed again, reached the most ideal principle of putting out a fire-cooling, suffocate and remove dust.

3. The fire extinguishing is rapid, and the fire extinguishing time is less than 2min through practical tests.

4. The utility model can not cause short circuit of electrical appliance fire, and common water can normally extinguish fire below 6000V and is not conductive; if distilled water is selected, the fire can be extinguished under the condition of high pressure of 10KV, and the fire cannot be extinguished and does not conduct electricity, and the explosion reaction with hot oil cannot happen.

5. The utility model discloses the pressure level of system is low, for the low pressure scope, has reduced the consumption of water, satisfies energy-conserving requirement.

6. The utility model discloses the shower nozzle aperture is big, does not have special requirement to quality of water.

7. The utility model discloses energy-conserving effect is obvious:

the dosage of the fire extinguishing agent, namely the dosage of water and gas, is greatly reduced.

Secondly, because of adopting the low-pressure atomization technology, the cost of the fire extinguishing system is greatly reduced.

8. The utility model discloses the fine water smoke particle diameter of production is little long in aerial suspension dwell time, is favorable to the dust fall, and the smoke elimination.

9. The fire extinguishing agent is made of nitrogen (or air) and water, and does not contain other chemicals, carbon dioxide and other harmful factors.

10. The utility model discloses at the fire extinguishing process, can not cause secondary water stain harm to protection object and building.

Drawings

Fig. 1 is a schematic structural view of the fire extinguishing nozzle of the utility model.

FIG. 2 the utility model discloses spun water mist droplet average particle size 28.5 mu m distribution diagram.

FIG. 3 is the utility model discloses spun water mist droplet average particle size 23 mu m distribution diagram.

In fig. 1: 1-bolt, 2-resonance body, 3-cone, 4-shell, 5-sealing ring, 6-upper cover, 7-body, 8-nut, 9-air inlet, 10-water flow joint, 11-water flow dividing slotted hole, 12-fine water spray outlet, 13-water flow inlet and 14-gas flow dividing hole.

Detailed Description

The embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in figure 1, a gas-liquid two-phase flow water mist fire extinguishing nozzle, this fire extinguishing nozzle includes bolt 1, nut 8, body 7, cone 3, resonance body 2, shell 4 and upper cover 6, resonance body 2 and cone 3 link together through bolt 1, the upper end of body 7 is provided with gas inlet 11, cone 3 is connected with body 7 through nut 8, shell 4 and body threaded connection, upper cover 6 and shell 4, body 7 threaded connection, be provided with gas diffluence hole 12 on the body 7 inner wall, gas diffluence hole 12 is a plurality of round hole equipartitions on body 7. A water diversion groove hole 11 is arranged at the lower end of the body 7 near the outer diameter, a water flow joint 10 is arranged on the side walls of the shell 4 and the body 7, the water flow joint hole is communicated with the water diversion groove hole 11, a sealing ring 5 for preventing water leakage is arranged at the gap between the body 7 and the shell 4 at the upper and lower positions of the water flow joint hole, and a fine spray outlet 12 is formed at the gap between the body 7 and the resonance body 2. The inner conical surface of the body 7 and the outer conical surface of the cone 3 form a horn-shaped cavity which is communicated with the water diversion slotted hole 11. The outlets for the gases are formed jointly by the body 7 and the cone 3 and are evenly distributed.

The resonator body 2 is specially designed to comply with acoustic principles.

Preferably, the gas distributing holes 14 arranged on the inner wall of the body 7 are uniformly distributed by 10 round holes.

Preferably, the water diversion slotted holes 11 arranged at the lower end of the body 7 near the outer diameter have round holes with the diameter phi of 1.2 and are evenly distributed.

Preferably, the body 7 and the cone 3 are made of copper alloy; the sealing ring is made of fluororubber; the other parts are all made of 304 stainless steel.

The utility model discloses resonance body 2 is through special design, accords with the acoustics principle. The fit among the resonant body 2, the cone 3 and the body 7 has high tolerance fit requirements, and the accuracy of the dimensional position and the clearance between the resonant body 2 and the body 7 after assembly is ensured.

The process of generating water mist according to the present invention is described below with reference to fig. 1:

the water path and the gas path in the gas-liquid two-phase flow water mist fire extinguishing nozzle are separated. The gas with the pressure of 0.5MPa +/-0.3 MPa enters the gas inlet 9 to reach the body 7, is divided by the 10 gas dividing holes 14, enters the inner conical surface of the body 7 and the outer conical surface of the cone 3 to form a horn-shaped cavity, is sprayed out through secondary division formed by the body 7 and the cone 3, strikes the resonance body 2, and then is sprayed out through fine water mist. Water with the pressure of 0.03MPa-0.1MPa enters the water flow joint 10 from the water flow inlet 13 and then enters the circular inner ring formed by the shell 4 and the body 7, and because the upper and the lower parts are sealed by the sealing rings 5, the water cannot leak from the interior of the fire extinguishing nozzle and then is sprayed out from the water flow dividing slotted hole 11. At this time, the water flowing out of the fire extinguishing nozzle is instantly atomized into fine mist droplets with the particle size of 5 to 100 mu m by the sound waves generated on the resonance body 2, and the fine mist droplets are sprayed out from the fine mist spray outlet 12 and rapidly spread to the whole space.

Fig. 2 and 3 are schematic views of particle size distribution test of the sprayed droplets of the present invention:

in the figure 2, the fire extinguishing nozzle with the flow rate of 2L/min is connected with 0.4MPa, the gas-liquid ratio is 1.35, and the average droplet diameter tested is 28.5 mu m.

In the figure 3, 0.5MPa of gas is introduced into a fire extinguishing nozzle with the flow rate of 2L/min, the gas-liquid ratio is 1.6, and the tested average droplet diameter is 23 mu m.

Through testing, the average droplet diameter of two different pressures and gas-liquid ratio ejections is smaller than 50 mu m, so that the small droplets can be rapidly filled in the whole protection space, and the total flooding effect is achieved.

Claims

1. A gas-liquid two-phase flow water mist fire extinguishing nozzle is characterized in that: the fire extinguishing nozzle comprises a bolt, a nut, a body, a cone, a resonance body, a shell and an upper cover, wherein the resonance body and the cone are connected together through the bolt; the cone and the body are connected into a whole by a nut; the upper end of the body is provided with a gas inlet, and a sealing washer is arranged at the connecting position of the nut in consideration of the impact effect of gas flow; the shell is in threaded connection with the body, the upper cover is in threaded connection with the shell and the body, a gas diversion hole is formed in the inner wall of the body, and a horn-shaped cavity is formed by the inner conical surface of the body and the outer conical surface of the cone and is communicated with the gas diversion hole; the water diversion slotted hole is arranged at the lower end of the body near the outer diameter, the water flow joint is arranged on the side walls of the shell and the body, the water flow joint hole is communicated with the water diversion slotted hole, the sealing ring for preventing water leakage is arranged at the gap between the body and the shell at the upper position and the lower position of the water flow joint hole, and the gap between the body and the resonance body forms a fine water mist spray outlet.

2. The gas-liquid two-phase flow water mist fire extinguishing nozzle according to claim 1, characterized in that: the gas distributing holes arranged on the inner wall of the body adopt a mode of evenly distributing 10 round holes.

3. The gas-liquid two-phase flow water mist fire extinguishing nozzle according to claim 1, characterized in that: the water diversion slotted holes with the diameter of phi 1.2 are uniformly distributed on the lower end of the body close to the outer diameter.