CN218485048U - Injection type supersonic velocity dry powder fire extinguishing device - Google Patents

Abstract

The utility model discloses an ejection type supersonic dry powder fire extinguishing device. A driving gas tank and a low-pressure tank are placed on the trolley, and the driving gas tank is provided with a gas injection port. The driving gas tank and the low-pressure tank are connected by a metal pipe, and a pressure reducing valve is installed on the metal pipe; a powder storage is fixed inside the low-pressure tank. device, one end of the metal hose for powder delivery is connected to the bottom of the powder storage device, the other end extends downward and is divided into two branches, and then leads out to the low-pressure tank body and then connects to the ejector nozzle; the low-pressure tank body is equipped with a supersonic The injection nozzle for powder spraying, the inlet end of the injection nozzle is connected with the sealed connector; under the action of air flow, the gas-solid two-phase flow in the injection nozzle crosses from subsonic speed to supersonic speed to realize jet flow. The utility model will eventually expand the high-speed fire extinguishing efficiency of the fire extinguishing device, and the setting of the injection type powder spraying makes the dry powder fully utilized, effectively and economically improves the fire extinguishing ability, and achieves the effect of noise reduction.

Description

An ejector type supersonic dry powder fire extinguishing device

technical field

The utility model relates to a fire-fighting equipment, in particular to an ejection type supersonic dry powder fire extinguishing device.

Background technique

Dry powder fire extinguisher is an important fire fighting tool, and many places will be equipped with fire extinguishing devices. Electrical failure and careless use of fire account for an absolute proportion of the causes of fires, and the task of disaster prevention and mitigation we face is still severe. Professional, convenient and efficient fire extinguishing device design technology is of great significance for quickly controlling the fire, avoiding casualties as much as possible, and effectively reducing losses. Only by fully understanding the gas-solid two-phase flow behavior inside and outside the dry powder fire extinguishing agent transportation channel, and systematically grasping the influence laws of geometry, physical properties and operating parameters, can we provide the key technology for the design of the core components of the dry powder fire extinguishing device.

The common disadvantages of currently used fire extinguishing devices are complex structure, high manufacturing cost, inconvenient use, and insufficient fire extinguishing performance. In order to better improve fire extinguishing efficiency and reduce fire extinguishing agent costs, it is necessary to develop an ejector supersonic Dry powder fire extinguishing device.

Utility model content

In order to solve the problems in the background technology, the utility model designs an ejection type supersonic dry powder fire extinguishing device.

The technical scheme of the utility model is as follows:

Including cart, sealing connector, driving gas tank, low-pressure tank, powder storage device, powder conveying metal hose and injection nozzle, the driving gas tank and low-pressure tank are placed on the cart, and the driving gas tank is equipped with injection The gas port, the drive gas tank and the low-pressure tank are connected by a metal pipe, and a pressure reducing valve is installed on the metal pipe;

A powder storage device is fixed inside the low-pressure tank. One end of the powder delivery metal hose is connected to the bottom of the powder storage device, and the other end extends downwards and is divided into two branches to lead out of the low-pressure tank body. The two branches of the powder delivery metal hose are connected to the bottom of the powder storage device. A sealing connector for sealing the tank is provided at the connection of the low-pressure tank;

The low-pressure tank is equipped with an ejector nozzle to realize supersonic powder spraying. The ejector nozzle includes a straight pipe section, a contraction section and an expansion section connected in sequence from the inlet end to the outlet end. The inlet end of the ejector nozzle passes through Connected to the sealed connector so as to communicate with the inside of the low-pressure tank, the two-way powder delivery metal hose is led out from the low-pressure tank and connected to the expansion section of the injection nozzle respectively, and the connection is close to the contraction section.

The inner diameter of the straight pipe section of the ejector nozzle remains unchanged; in the direction along the inlet end to the outlet end, the inner diameter of the contraction section changes from large to smaller, and the inner diameter of the expansion section changes from large to smaller; the radius of the inlet end of the ejector nozzle 10.2 mm to 12.7 mm, preferably 11.5 mm; the radius of the outlet end is 14.8 mm to 17.3 mm, preferably 16.1 mm; the radius of the joint between the expansion section and the contraction section is 6.85 mm to 9.25 mm, preferably 8.05 mm.

The axial length of the straight section is 44.8mm-47.2mm, preferably 46mm; the axial length of the contraction section is 67.8mm-70.2mm, preferably 69mm; the axial length of the expansion section is 136.8mm-139.2mm, preferably 138mm.

The shrinkage angle α of the contraction section is between 3.16°-5.54°, preferably 5.3°; the expansion angle β of the expansion section is between 1.2°-3.5°, preferably 3.34°; the two-way powder conveying metal hose and the low-pressure tank The powder delivery angle θ at the connection is 45°, preferably 30°-50°.

A spherical control dry powder flow valve is installed on the main road of the powder conveying metal hose;

Spherical control dry powder flow valve is used to control the flow of dry powder to prevent continuous output of dry powder due to gravity;

A spherical control gas flow valve is installed at the outlet end of the ejector nozzle so as to control the intermittent operation of the air flow and interrupt the injection at any time.

The pressure reducing valve is provided with two pressure gauges, which are used to measure the pressure values in the low-pressure tank and the driving gas tank respectively, so as to facilitate real-time understanding of pressure changes.

The pressure reducing valve is used to control the air flow to reduce the pressure of the air flow entering the low pressure tank.

The pressure value of the low-pressure tank is controlled between 1.4MPa and 2.5MPa, and the pressure value of the driving gas tank is controlled between 12.4MPa and 13.7MPa.

The material of the driving gas tank is high pressure resistant material.

Because the tank body has a certain weight, the driving gas tank and the low-pressure tank are fixed on the trolley through the fixed protective ring, so that it is convenient to move to the fire extinguishing place.

A noise reduction device for reducing noise is installed in the expansion section of the injection nozzle.

The gas injection port is used for supplementing gas.

According to the specification "GB8109-2005-Trolley Fire Extinguisher", the length of the ejector nozzle is 5 meters, and the ejector nozzle should be securely fixed in the storage box or clamping device to prevent it from being destroyed in a dangerous moment. Quickly and easily unfolded for use.

The beneficial effects of the utility model:

1) The ejector nozzle of the present utility model can generate supersonic airflow, which expands the high-speed fire extinguishing efficiency of the fire extinguishing device, and the setting of the ejector spray powder enables the dry powder to be fully utilized, effectively and economically improving the fire extinguishing ability;

2) The utility model can freely adjust the jetting direction of the ejector nozzle; there is no flying object during work, and the noise reduction effect is achieved.

Description of drawings

Fig. 1 is a schematic diagram of the overall appearance of the utility model.

Fig. 2 is a structural schematic diagram of the utility model.

Figure 3 is a schematic diagram of an ejector-type supersonic nozzle.

Fig. 4 is a comparison diagram of the particle velocity of the dry powder in the device of the present invention and the existing fire extinguishing device along the axial direction of the nozzle.

In the figure: 1 cart, 2 pressure gauge, 2 gas injection port, 3 gas injection port, 4 metal connecting pipe, 5 tank fixed protection ring, 6 pressure reducing valve, 7 driving gas tank, 8 low pressure tank, 9 powder storage device, 10 Spherical control of dry powder flow, 11 Sealed connector, 12 Metal hose for powder delivery, 13 Injection nozzle, 14 Noise reduction device, 15 Spherical control gas flow valve.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figures 1 and 2, the utility model includes a trolley 1, a sealed connector 11, a driving gas tank 7, a low-pressure tank 8, a powder storage device 9, a powder metal hose 12 and an injection nozzle 13, Two tank bodies are fixed on the trolley, a driving gas tank 7 and a low-pressure tank 8, and a gas injection port 3 is set on the driving gas tank for supplying gas. The driving gas tank 7 and the low pressure tank 8 are connected by a metal pipe 4, and a pressure reducing valve 6 is installed on the metal pipe 4; two pressure gauges 2 are installed on the pressure reducing valve 6 to measure the pressure in the low pressure tank and the driving gas tank respectively. Pressure value.

A powder storage device 9 is installed in the low-pressure tank 8, and the powder storage device 9 is connected to a powder delivery metal hose 12. A spherical control dry powder flow valve 10 is installed on the main road of the powder delivery metal hose 12, and the powder delivery metal hose 12 is led out of the tank and then connected To the expansion section of the injection nozzle 13, a sealing connector 11 for sealing the tank is provided at the connection between the powder conveying metal hose 12 and the injection nozzle 13; the injection nozzle is connected to the lower right side of the low-pressure tank According to the specification "GB8109-2005-Trolley Fire Extinguisher", the length of the metal hose is 5 meters, and an adjustable injection control valve is equipped at the end of the injection nozzle for intermittent operation and interruption of injection at any time. And a noise reduction device is installed at the outlet end of the injection nozzle to achieve the effect of noise reduction.

As shown in Figure 3, the structure diagram of the injection nozzle after the part circled in Figure 2 is enlarged, the injection nozzle 13 includes straight pipe section AB, contraction section BC and expansion section CD connected in sequence from the inlet end to the outlet end; The inner diameter of the straight pipe section of the ejector nozzle 13 is constant; in the direction along the inlet end to the outlet end, the inner diameter of the contraction section changes from large to smaller, and the inner diameter of the expansion section changes from large to smaller; the radius of the inlet end of the ejector nozzle 13 is 10.2mm ~ 12.7mm; the radius of the outlet end is 14.8mm ~ 17.3mm; the radius of the junction between the expansion section and the contraction section is 6.85mm ~ 9.25mm. The axial length of the straight section is 44.8mm-47.2mm, preferably 46mm; the axial length of the contraction section is 67.8mm-70.2mm, preferably 69mm; the axial length of the expansion section is 136.8mm-139.2mm, preferably 138mm. The contraction angle α of the contraction section is between 3.16°～5.54°, preferably 5.3°; the expansion angle β of the expansion section is between 1.2°～3.5°, preferably 3.34°; the output of the two-way powder delivery metal hose 12 The inclination angle θ=45° of the end relative to the horizontal line is preferably 30°-50°.

The driving gas tank is used to provide a gas source, using high pressure resistant materials; the pressure reducing valve 6 is used to reduce the pressure; the gas injection port is used to supplement the gas; The dry powder fire extinguishing agent with diameter and superior performance; the spherical control dry powder flow valve 10 is used to control the flow of dry powder to prevent the continuous output of dry powder due to gravity; the metal hose 12 for powder delivery is a metal hose to reduce friction; To reduce noise, a noise reduction device 14 is installed in the expansion section of the ejector supersonic nozzle; due to the certain weight of the tank body, the tank body is fixed on the cart 1 through the fixed protection ring 5, so that it is convenient to move to the fire extinguishing place.

The concrete work process that the utility model implements:

S1: Open the low-pressure tank first, put the dry powder fire extinguishing agent into the powder storage device in the low-pressure tank, and then close the low-pressure tank;

S2: Fill gas into the driving gas tank through the gas injection port. After the pressure in the driving gas tank rises to a stable value, open the pressure reducing valve, and the air in the driving gas tank enters the low-pressure tank through the metal connecting pipe, so that the pressure in the low-pressure tank reach a stable value;

S3: Open the spherical control dry powder flow valve and the spherical control gas flow valve, the dry powder fire extinguishing agent in the powder storage device enters the injection nozzle through the powder delivery metal hose under the pressure of the air flow in the low-pressure tank, and part of the air flow is ejected from the injection nozzle. The inlet end of the type nozzle enters, and the airflow velocity at the inlet end is subsonic;

S4: In the expansion section of the injection nozzle, the dry powder fire extinguishing agent meets the airflow entering the injection nozzle to form a gas-solid two-phase flow. The speed of the phase flow in the expansion section spans from subsonic to supersonic to realize jet flow.

As shown in Figure 4, according to the Fluent 19.0 software simulation, the particle velocity comparison diagram of the dry powder in the utility model device (injection powder feeding) and the existing fire extinguishing device (axial powder feeding) along the nozzle axis direction can be seen The particle velocity to the ejection type powder feeding is larger than that of the axial powder feeding, and compared with the axial powder feeding, the ejection type powder feeding of the utility model can spray a farther distance under the premise of maintaining high speed, thus the effect better.

The highest particle speed of the utility model can reach 415m/s.

The calculation method of the particle velocity of the dry powder fire extinguishing agent in the utility model device along the nozzle axis direction is as follows:

1) Calculate the initial particle velocity v when the dry powder fire extinguishing agent enters the injection nozzle 13, the specific calculation formula is as follows:

Among them, A _e is the area of the outlet end of the nozzle; A ^* is the area of the throat of the nozzle, and the throat of the nozzle is the junction of the constriction section and the expansion section; p ₀ is the pressure value at the inlet end of the nozzle, which is the Pressure value; p _e is the pressure value of the environment; M is the Mach number at the outlet of the nozzle, a is the speed of sound, which is 340m/s; γ=1.4;

2) Input the structural parameters of the ejector nozzle and the calculated initial velocity v into the Fluent 19.0 software to simulate the movement of the gas-solid two-phase flow in the ejector nozzle 13, so as to obtain the flow rate of the dry powder fire extinguishing agent from the ejector nozzle. The velocity of the particles ejected from the outlet end of the tube 13. The structural parameters of the injection nozzle include the length, inner diameter and expansion angle of the injection nozzle.

Claims (8)

1. An injection type supersonic dry powder fire extinguishing device is characterized in that: comprising cart (1), sealed connector (11), driving gas tank (7), low-pressure tank (8), powder storage device (9), Powder conveying metal hose (12) and injection nozzle (13), driving gas tank (7) and low-pressure tank (8) are placed on the trolley (1), and the driving gas tank (7) is provided with a gas injection port (3), the driving gas tank (7) and the low-pressure tank (8) are connected by a metal pipe (4), and a pressure reducing valve (6) is installed on the metal pipe (4); A powder storage device (9) is fixed inside the low-pressure tank (8). One end of the powder delivery metal hose (12) is connected to the bottom of the powder storage device (9), and the other end extends downward and is divided into two branches to lead out to the low-pressure tank ( 8) tank body, the connection between the two branches of the metal hose for powder delivery (12) and the low-pressure tank (8) is provided with a sealing connector (11) for sealing the tank body; The low-pressure tank (8) is equipped with an injection nozzle (13) for supersonic powder spraying outside the tank. The injection nozzle (13) includes a straight pipe section, a contraction section and an expansion section connected in sequence from the inlet end to the outlet end. , the inlet end of the injection nozzle (13) communicates with the inside of the low-pressure tank (8) by being connected to the sealed connector (11), and the two-way powder delivery metal hose (12) is connected to the inside of the low-pressure tank (8) After being drawn out, they are respectively connected to the expansion section of the injection nozzle (13), and the connection is close to the contraction section. 2. A kind of injection type supersonic dry powder fire extinguishing device according to claim 1, is characterized in that: the straight pipe section internal diameter of described injection type nozzle (13) is constant; On the direction along inlet end to outlet end, The inner diameter of the contraction section changes from large to small, and the inner diameter of the expansion section changes from large to small; The radius of the inlet end of the injection nozzle (13) is 10.2mm-12.7mm; the radius of the outlet end is 14.8mm-17.3mm; the radius of the connection between the expansion section and the contraction section is 6.85mm-9.25mm. 3. An ejector-type supersonic dry powder fire extinguishing device according to claim 2, characterized in that: the axial length of the straight pipe section is 44.8mm-47.2mm; the axial length of the contraction section is 67.8mm-70.2mm; The axial length of the segment is 136.8 mm to 139.2 mm. 4. An ejector-type supersonic dry powder fire extinguishing device according to claim 1, characterized in that: the contraction angle α of the contraction section is between 3.16° and 5.54°; the expansion angle β of the expansion section is 1.2° to 3.5° Between; the powder delivery angle θ at the junction of the two powder delivery metal hoses (12) and the low-pressure tank (8) is 30° to 50°. 5. A jet-type supersonic dry powder fire extinguishing device according to claim 1, characterized in that: A spherical control dry powder flow valve (10) is installed on the main road of the powder conveying metal hose (12); A spherical control gas flow valve (15) is installed at the outlet end of the injection nozzle (13). 6. An ejection-type supersonic dry powder fire extinguishing device according to claim 1, characterized in that: the pressure reducing valve (6) is provided with two pressure gauges (2) for measuring the pressure of the low-pressure tank (8) ) and the pressure value in the driving gas tank (7). 7. An ejection type supersonic dry powder fire extinguishing device according to claim 1, characterized in that: the pressure reducing valve (6) is used to control the airflow to reduce the pressure of the airflow entering the low-pressure tank (8). 8. An injection type supersonic dry powder fire extinguishing device according to claim 1, characterized in that: the pressure value of the low-pressure tank (8) is controlled between 1.4MPa and 2.5MPa, and the pressure of the driving gas tank (7) The pressure value is controlled between 12.4MPa and 13.7MPa.

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