CN110507932A - External self-expanding foam fire-fighting device for liquefied medium - Google Patents

Abstract

The invention discloses an external liquefied medium self-expanding foam fire-fighting device, which comprises a foam mixed liquid storage device (1) for containing the foam mixed liquid and a foam mixed liquid storage device (1) for containing the liquefied medium and capable of storing the foam mixed liquid. A liquefied medium storage device (2) for injecting liquefied medium into the device; it also includes a gas-liquid mixer (3) with a gas-liquid mixing chamber, which is communicated with the gas-liquid mixing chamber to be provided with a foam mixed liquid inlet (31), a liquefied gas inlet ( 32) and the foam outlet (33); wherein, the foam mixed liquid inlet is used to communicate with the liquid phase of the foam mixed liquid storage device, and the liquefied gas inlet is used to communicate with the gas phase space of the foam mixed liquid storage device, and the foam mixed liquid and liquefied gas The foam generated by mixing in the gas-liquid mixer is sprayed out from the foam outlet. The foam fire-fighting device provided by the present invention can solve the defects of the prior art in which compressed gas is used to generate foam, which takes up a large space, requires extra power, and the like.

Description

External self-expanding foam fire-fighting device for liquefied medium

technical field

The invention relates to the technical field of fire extinguishing, in particular to an external liquefied medium self-expanding foam fire-fighting device.

Background technique

Existing compressed gas foam fire extinguishing mainly adopts the mode of mixing gas and foam mixture to generate foam for fire extinguishing. The specific compressed gas foam fire extinguishing methods mainly include atmospheric pressure compressed gas foam fire extinguishing and gas storage foam fire extinguishing methods.

Among them, atmospheric compressed gas foam fire extinguishing usually uses a compressor or a compressed gas cylinder for gas supply, and the pressure remains basically unchanged during the injection process, but the compressor and compressed gas cylinder supply are limited, which cannot meet the requirements of large flow and high pressure. Gas supply requirements, and to achieve large flow and high pressure gas supply, it is necessary to set up multiple compressors or compressed gas cylinders (such as a foam fire truck with a flow rate of 150L/S as an example, the gas supply flow rate is 1050L/S s, its gas supply needs to be supplied by multiple large air compressors), it takes up a lot of space, and there is often no space for layout in the oil depot tank area and equipment area, which is not conducive to on-site layout. Moreover, the foam produced by the suction method has the following defects: the foam bubbles are of different sizes, the foam is uneven, the performance is unstable, the foam is easily broken, the burning resistance is poor, and the fire extinguishing efficiency is not high.

Another type of gas-storage foam fire extinguishing usually stores compressed gas in the fire extinguishing agent container. When a large flow rate is sprayed, the compressed gas will be consumed in large quantities, and the injection pressure will be greatly reduced as the injection continues. At this time, in order to ensure the high-pressure injection of the fire extinguishing agent, It is necessary to replenish the compressed gas in the fire extinguishing agent container in a timely manner, and in the state of large flow injection, the air compressor and the compressed gas cylinder alone cannot guarantee sufficient supply of compressed gas, resulting in the inability to effectively achieve the high-pressure injection requirements and affecting the fire extinguishing effect . When a major fire is extinguished, it is necessary to produce a large flow of foam for fire extinguishing. At this time, the flow rate of the foam mixture increases, and the supply volume of the compressed gas also needs to increase accordingly. However, the existing compressed gas foam production method cannot achieve large flow and high pressure. For the supply of compressed gas, the flow rate of the foam mixture is only 20-30L/s. It is mainly used for general-scale fire fighting, such as building fires, small-scale flowing fires on the ground, etc. It cannot be used in large-scale storage device fires or large-scale fires. Application in ground flowing fires. Moreover, the existing compressed gas foam generation method requires additional power to compress the gas, and the equipment structure and management operations are complicated.

For this reason, it is necessary to provide a new way of generating foam to overcome the existing defects of using compressed gas foam fire extinguishing and gas storage foam fire extinguishing in the prior art.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the way of compressing gas to generate foam in the prior art, which takes up a lot of space and requires extra power.

In order to achieve the above object, the present invention provides an external liquefied medium self-expanding foam firefighting device on the one hand, the foam firefighting device includes a foam mixture storage device for containing the foam mixture and a storage device for containing the liquefied medium and A liquefied medium storage device capable of injecting a liquefied medium into the foam mixture storage device;

The foam fire-fighting device also includes a gas-liquid mixer with a gas-liquid mixing chamber, which is connected with the gas-liquid mixing chamber to be provided with a foam mixture inlet, a liquefied gas inlet, and a foam outlet;

Wherein, the foam mixed liquid inlet is used for communicating with the liquid phase of the foam mixed liquid storage device so as to input the foam mixed liquid in the foam mixed liquid storage device into the gas-liquid mixer, and the liquefied gas inlet is used for communicated with the gas-phase space of the foam mixed liquid storage device for inputting the liquefied gas generated by the gasification of the liquefied medium in the foam mixed liquid storage device into the gas-liquid mixer, the foam mixed liquid and The foam generated by mixing the liquefied gas in the gas-liquid mixer is sprayed out from the foam outlet.

Preferably, the gas-liquid mixer is located outside the foam mixture storage device, the foam mixture inlet and the liquefied gas inlet are respectively connected to the foam mixture storage device through pipelines, and the foam mixture A second control valve is provided on the pipeline between the liquid inlet and the foam mixture storage device, and a third control valve is provided on the pipeline between the liquefied gas inlet and the foam mixture storage device.

Preferably, the pipeline between the foam mixture storage device and the liquefied medium storage device is provided with a first control valve for controlling the flow rate of the liquefied medium, and the foam mixture storage device is provided with a device for measuring pressure gauge;

The foam fire fighting device further includes a control unit, and the control unit adjusts the flow rate of the first control valve according to the pressure of the pressure gauge.

Preferably, one liquefied medium storage device is provided, and one or more foam mixed liquid storage devices are provided, and the liquefied medium storage device is connected to one or multiple foam mixed liquid storage devices;

Alternatively, multiple liquefied medium storage devices are provided, and the multiple liquefied medium storage devices are connected together through a confluence pipeline, and the confluence pipeline is connected to one or a plurality of the foam mixture storage devices.

Wherein, each of the foam mixed liquid storage devices is correspondingly provided with one of the gas-liquid mixers;

Preferably, the working pressure of the foam mixture storage device is 0.4-1.4Mpa.

Preferably, the working pressure of the foam mixture storage device is 0.6-1.0Mpa, and the pressure fluctuation range of the foam mixture storage device is ±0.1Mpa.

Preferably, the liquefied medium storage device is configured such that the stored liquefied medium is pressed into the foam mixture storage device under gas pressure.

Preferably, one end of the gas-liquid mixer is provided with the foam mixture inlet, and the other end is provided with the foam outlet, and the liquefied gas inlet is provided on the side wall between the two ends of the gas-liquid mixer.

Preferably, one or more liquefied gas inlets are provided, and the plurality of liquefied gas inlets are arranged at intervals along the circumference of the side wall of the gas-liquid mixer.

Preferably, the relationship between the area S1 of the foam mixture inlet and the area S2 of the liquefied gas inlet is: S1/S2=10-60;

The relationship between the area S4 of the foam outlet and the area S1 of the foam mixture inlet is: S4/S1=1.5-6.

Preferably, the relationship between the area S1 of the foam mixture inlet and the area S2 of the liquefied gas inlet is: S1/S2=16-40;

The relationship between the area S4 of the foam outlet and the area S1 of the foam mixture inlet is: S4/S1=2.5˜5.

Preferably, the gas-liquid mixing chamber of the gas-liquid mixer is provided with a spoiler for disturbing the liquid flow, and the liquefied gas inlet is on the side between the spoiler and the foam mixture inlet. on the wall.

Preferably, the spoiler is formed into a cone structure, a hemispherical structure or a platform structure;

The conical top of the conical structure, the spherical top of the hemispherical structure or the platform top of the platform structure faces the foam mixture inlet.

Preferably, the relationship between the maximum cross-section S3 of the spoiler and the area S1 of the foam mixture inlet is: S3/S1=1.1˜3.8.

Preferably, the relationship between the maximum cross-section S3 of the spoiler and the area S1 of the foam mixture inlet is: S3/S1=1.4˜3.

Preferably, the gas-liquid mixing chamber is provided with at least one porous structure arranged at intervals; each of the porous structures is provided with a plurality of holes; the holes of the porous structure face the inlet of the foam mixture, and the The top of the spoiler is closer to the foam mixture inlet than the porous structure.

The technical solution provided by the invention avoids the technical route of using compressed gas supply to generate foam in the prior art. In the technology provided by the invention, after the liquefied medium is input into the foam mixed liquid storage device, the liquefied medium self-expands and gasifies to generate gas , the pressure in the foam mixture storage device rises, and the gas generated by gasification and expansion in the storage device and the foam mixture can automatically enter the gas-liquid mixer under gas pressure and mix to generate foam. No additional power is required, and the maintenance is simple and easy. operate. In addition, the technical solution provided by the present invention solves the problem of large space occupation caused by the need to equip air compressors and compressed gas cylinders when using compressed gas to generate foam in the prior art, and the problem of using air compressors and compressed gas in the prior art The steel cylinder cannot ensure sufficient replenishment of compressed gas, resulting in the problem that the high-pressure injection requirements cannot be effectively realized.

Description of drawings

Figure 1 is a schematic structural view of an external liquefied medium self-expanding foam firefighting device according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of an external liquefied medium self-expanding foam fire fighting device according to another embodiment of the present invention;

Fig. 3 is the structural representation of gas-liquid mixer;

Fig. 4 is a schematic diagram of the layout of the liquefied gas inlet of the gas-liquid mixer;

Fig. 5 is a kind of structural representation of spoiler;

Fig. 6 is another kind of structural representation of spoiler;

Fig. 7 is another structural schematic diagram of the bypass flow device.

Explanation of reference signs

1-foam mixture storage device; 2-liquefied medium storage device; 3-gas-liquid mixer; 31-foam mixture inlet; 32-liquefied gas inlet; 33-foam outlet; 34-disturbator; 35-porous structure ; 4-pressure gauge; 5-first control valve; 6-second control valve; 7-third control valve; 8-fourth control valve; 9-foam injector.

Detailed ways

Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In describing the present invention, it is to be understood that the terms "central", "upper", "lower", "vertical", "horizontal", "top", "bottom", "axial", "radial ", "circumferential", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the It should not be construed as limiting the invention that a device or element must have a particular orientation, be constructed, and operate in a particular orientation.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

The present invention provides an external liquefied medium self-expanding foam fire-fighting device, as shown in Figure 1 and Figure 2, the foam fire-fighting device includes a foam mixed liquid storage device 1 for containing the foam mixed liquid and a storage device for containing the liquefied Medium and a liquefied medium storage device 2 capable of injecting liquefied medium into the foam mixed liquid storage device 1; the foam fire fighting device also includes a gas-liquid mixer 3 with a gas-liquid mixing chamber placed outside the foam mixed liquid storage device 1 A foam mixture inlet 31, a liquefied gas inlet 32 and a foam outlet 33 are provided in communication with the gas-liquid mixing chamber;

Wherein, the foam mixed liquid inlet 31 is used for communicating with the liquid phase of the foam mixed liquid storage device 1 so as to input the foam mixed liquid in the foam mixed liquid storage device 1 into the gas-liquid mixer 3, and the liquefied gas inlet 32 is used for It communicates with the gas phase space of the foam mixed liquid storage device 1 for the liquefied gas generated by the gasification of the liquefied medium in the foam mixed liquid storage device 1 to enter the gas-liquid mixer 3, and the foam mixed liquid and liquefied gas are in the gas-liquid mixer 3 The foam generated by the internal mixing is ejected from the foam outlet 33 .

The technical solution provided by the present invention avoids the technical route of using compressed gas supply to generate foam in the prior art. In the technical solution of the present invention, after the liquefied medium is input into the foam mixed liquid storage device 1, the liquefied medium self-expands and gasifies Gas is generated, and the pressure in the foam mixed liquid storage device 1 increases, and the gas generated by expansion and gasification in it and the foam mixed liquid can automatically enter the gas-liquid mixer 3 to mix and generate foam under the pressure of the gas generated by gasification. Extra power, simple maintenance and easy operation.

In addition, the technical solution provided by the present invention solves the problem in the prior art that air compressors and compressed gas cylinders are required to occupy a large space when using compressed gas to generate foam, as long as the liquefied medium is continuously supplied to the foam mixture storage Device 1 will self-expand to generate enough liquefied gas to mix with the foam mixture to generate foam, thereby solving the problem that the air compressor and compressed gas cylinder cannot ensure sufficient supply of compressed gas in the prior art, resulting in the inability to effectively achieve high pressure. Questions about jetting requirements.

In the technical solution provided by the present invention, preferably, the liquefied medium storage device 2 is configured such that the stored liquefied medium is pressed into the foam mixture storage device 1 under gas pressure.

In application, the liquefied medium storage device 2 containing liquefied medium such as liquid nitrogen or liquid carbon dioxide is communicated with the foam mixture storage device 1, and the gas pressure of the liquefied medium (such as the pressure generated by the gasification of the liquefied medium itself or other gas pressure) Pushed into the foam mixed liquid storage device 1, then the liquefied medium is vaporized in the foam mixed liquid storage device 1 so that the pressure in the foam mixed liquid storage device 1 increases, so that the gasified liquefied gas and the foam mixed liquid are in the It enters the gas-liquid mixer 3 under pressure, so that the liquefied gas and the foam mixture can mix and foam in the gas-liquid mixer 3 and spray the foam.

Through the gas pressure, the liquefied medium enters the foam mixture storage device 1, so that automatic foaming can be better realized, as long as the valve is opened, the liquefied medium in the liquefied medium storage device 2 will be under the pressure generated by the gas entering or the gasification of the liquefied medium itself down into the foam mixture storage device 1, the foam can be automatically foamed without additional power.

In the present invention, the foam mixture is produced by mixing the original foam solution for fire extinguishing with water, and the liquefied medium can be at least one of liquid nitrogen, liquid carbon dioxide, liquefied inert gas, and liquefied halogenated hydrocarbon gas. Since the foam produced by mixing the liquefied medium with the foam mixture is used for fire extinguishing, the type of gas produced by the liquefied medium is limited to be helpful for fire extinguishing, that is, the gas that can suppress and suffocate the fire, and has no effect on the foam. It cannot be destructive by itself. Usually, liquid nitrogen is used as the liquefaction medium, and liquid nitrogen is vaporized into gas at room temperature, so gas can be obtained without additional operations. Liquid nitrogen requires minimal maintenance during storage, which is convenient for users to use and manage. In addition, the vaporization ratio of liquid nitrogen is 700-710 times, and a unit volume of liquid nitrogen can be used to foam the foam mixture more than 10 times.

In a specific embodiment of the present invention, as shown in FIG. 1 , the gas-liquid mixer 3 is located outside the foam mixed liquid storage device 1, and the foam mixed liquid inlet 31 and the liquefied gas inlet 32 are respectively connected to the foam mixed liquid storage device 1 through pipelines. connect. Specifically, the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is connected to the bottom of the foam mixed liquid storage device 1 to communicate with the liquid phase of the foam mixed liquid storage device 1, and the liquefied gas inlet 32 is connected to the foam mixed liquid storage device 1. The upper part is connected to communicate with the gas phase space of the foam mixed liquid storage device 1 .

Wherein, a first control valve 5 is arranged on the pipeline between the liquefied medium storage device 2 and the foam mixture storage device 1, and the pipeline between the foam mixture inlet 31 of the gas-liquid mixer 3 and the foam mixture storage device 1 The second control valve 6 is arranged on the road, the third control valve 7 is arranged on the pipeline between the liquefied gas inlet 32 and the foam mixed liquid storage device 1, and the control valve (Fig. 1 not shown).

Preferably, the foam mixture storage device 1 is provided with a pressure gauge 4 for measuring the pressure in the gas phase space in the tank. The external liquefied medium self-expanding foam fire-fighting device also includes a control unit, which can adjust the flow rate of the first control valve 5 according to the pressure of the pressure gauge 4, so as to ensure that the pressure in the foam mixture storage device 1 is constant or at a certain level. fluctuate within the range.

When there is no fire state, the foam mixture storage device 1 is under normal pressure, the valve of the foam outlet 33 of the gas-liquid mixer 3 is in a normally closed state, and the first control valve 5, the second control valve 6 and the third control valve 7 Both are in the normally closed state, the valve of the self-pressurizing device of the liquefied medium storage device 2 is in the open state, and the gas phase space of the liquefied medium storage device 2 is filled with gas at a certain pressure. The self-pressurizing device is a device built in the liquefied medium storage device 2 that helps to vaporize the liquefied medium so that a relatively high pressure can be maintained in the liquefied medium storage device 2 .

In the event of a fire, the first control valve 5 between the liquefied medium storage device 2 and the foam mixed liquid storage device 1 is opened, and the liquefied medium enters the foam mixed liquid under the pressure gas in the gas phase space of the liquefied medium storage device 2. storage device 1, and immediately gasify, after gasification, the pressure of the gas phase space in the foam mixed liquid storage device 1 continues to rise, after rising to a predetermined value, the second control valve 6 and the third control valve 7 are opened, and at the same time The valve of the foam outlet 33 is also opened, and the foam mixed liquid and the liquefied gas are pressed into the gas-liquid mixer 3 through the pipeline to mix and foam, and are sprayed out by the foam injector of the foam outlet 33 . After you finish spraying, refill the foam mixture.

Wherein, during fire extinguishing, during the process of injecting the liquefied medium into the foam mixture storage device 1, the pressure in the foam mixture storage device 1 remains constant. If the pressure in the device is higher than a predetermined value (according to the pressure gauge 4), the control unit An instruction is given to reduce the opening degree of the first control valve 5 to reduce the flow rate of the liquefied medium; otherwise, to increase the opening degree of the first control valve 5 to increase the flow rate of the liquefied medium.

The flow rate of the liquefied medium depends on the size of the gas phase space of the foam mixture storage device 1 and the foam flow rate of the foam outlet 33 . The amount of injected liquefied medium should satisfy the pressure in the foam mixture storage device 1 to be constant or fluctuate within a predetermined range, so as to meet the demand for foaming. By adjusting the opening degree of the first control valve 5 by the control unit, the flow regulation of the liquefied medium can be realized. The working pressure of the foam mixed liquid storage device 1 is preferably 0.4-1.4Mpa, more preferably 0.6-1.0Mpa, and the pressure fluctuation range is ±0.1Mpa. The working pressure is the pressure in the foam mixture storage device 1 when the foam fire fighting device generates foam.

The foam fire-fighting device provided by the present invention is easy to operate when extinguishing a fire. After confirming the fire situation, the first control valve 5 and the pipeline valves in the corresponding fire area can be manually opened; automatic valves can also be installed on each pipeline for remote start; If fire monitoring equipment has been set up in the protected area, the monitoring equipment can be linked with the foam fire fighting device, that is, when the fire monitoring equipment monitors a fire, the automatic control valve is controlled to open automatically, and the liquefied medium in the liquefied medium storage device 2 is automatically activated under the gas pressure. Enter the foam mixture storage device 1, and then the liquefied gas and foam mixture in the foam mixture storage device 1 enter the gas-liquid mixer 3 to mix and foam, so that the foam fire extinguishing can be automatically activated.

In the technical solution provided by the present invention, one liquefied medium storage device 2 may be connected to one foam mixture storage device 1 , or may be connected to multiple foam mixture storage devices 1 . Figure 1 shows an embodiment in which a liquefied medium storage device 2 can be connected to a foam mixture storage device 1, and Figure 2 shows an embodiment in which a liquefied medium storage device 2 is connected to a plurality of foam mixture storage devices 1 .

As shown in Figure 2, one liquefied medium storage device 2 is provided, and there are multiple foam mixed liquid storage devices 1, and the liquefied medium storage device 2 is respectively connected to a plurality of foam mixed liquid storage devices 1 to provide a plurality of foam mixed liquid storage devices. 1 provides the liquefied medium; each foam mixed liquid storage device 1 is correspondingly provided with a gas-liquid mixer 3 (the connection between the foam mixed liquid storage device 1 and the gas-liquid mixer 3 is not shown in this Figure 2, it can be shown in Figure 1 connection shown). A foam injector 9 can be connected to the foam outlet 33 of each gas-liquid mixer 3 to facilitate foam injection. In addition, a first control valve 5 is set on the main pipeline between the liquefied medium storage device 2 and the foam mixed liquid storage device 1, and a fourth control valve 8 is set on each branch pipeline to control the flow to each foam mixed liquid storage device respectively. 1 flow of liquefied medium.

In addition, multiple liquefied medium storage devices 2 can also be provided to achieve continuous supply of liquefied medium. Multiple liquefied medium storage devices 2 are connected together through a confluence pipeline, and the confluence pipeline is mixed with one or more foams The liquid storage device 1 is connected. Similarly, each foam mixed liquid storage device 1 is correspondingly provided with a gas-liquid mixer 3 .

The specific structure of the lower gas-liquid mixer 3 will be described in detail below.

As shown in Figure 3, in this embodiment, one end of the gas-liquid mixer 3 is provided with a foam mixture inlet 31, the other end is provided with a foam outlet 33, and the liquefied gas inlet 32 is arranged between the two ends of the gas-liquid mixer 3 on the side walls of the room. Preferably, the gas-liquid mixer 3 is a cylindrical structure or a square cylindrical structure, the foam mixture liquid inlet 31 is arranged at one end of the cylindrical structure, and the foam outlet 33 is arranged at the other end of the cylindrical structure.

One or more liquefied gas inlets 32 may be provided, and in the case of multiple liquefied gas inlets 32 arranged at intervals along the circumference of the side wall of the gas-liquid mixer 3 (as shown in FIG. 4 ). In addition, a plurality of foam mixture liquid inlets 31 and foam outlets 33 may be provided, and the arrangement of each port is not limited to that in this embodiment.

Preferably, the relationship between the area S1 of the foam mixture inlet 31 and the area S2 of the liquefied gas inlet 32 is: S1/S2=10-60; the area S4 of the foam outlet 33 and the area S4 of the foam mixture inlet 31 The relationship between the areas S1 is: S4/S1=1.5-6.

More preferably, the relationship between the area S1 of the foam mixture inlet 31 and the area S2 of the liquefied gas inlet 32 is: S1/S2=16-40; the area S4 of the foam outlet 33 and the area S1 of the foam mixture inlet 31 The relationship among them is: S4/S1=2.5～5. By controlling the area ratio relationship of each port, it is helpful to control the flow relationship of each port, so that the foaming can be made more fully and the foam with higher quality can be obtained. Wherein, the area of each port mentioned here is the total area, for example, the area of the liquefied gas inlet 32 is the total area of the plurality of liquefied gas inlets 32 .

In this embodiment, a spoiler 34 for disturbing the liquid flow is provided in the gas-liquid mixing chamber of the gas-liquid mixer 3 , so that the foam mixed liquid and the liquefied gas are fully mixed. Preferably, the liquefied gas inlet 32 is on the side wall between the spoiler 34 and the foam mixture inlet 31 .

Wherein, the spoiler 34 can be formed as a cone structure (as shown in Figure 5), a hemispherical structure (as shown in Figure 6) or a platform structure (as shown in Figure 7) or other irregularly shaped structures, the cone structure The conical top, the spherical top of the hemispherical structure or the platform top of the platform structure faces the foam mixture inlet 31 . The spoiler 34 is installed so that the top faces the foam mixture inlet 31, and the mixed fluid of the liquefied gas and the foam mixture rushes to the spoiler 34, which can facilitate the sufficient mixing of the liquefied medium and the foam mixture to obtain uniform foaming and good performance. bubbles.

Preferably, the relationship between the maximum cross-section S3 of the spoiler 34 and the area S1 of the foam mixture inlet 31 is: S3/S1=1.1-3.8, more preferably, S3/S1=1.4-3.

The ratio between the area S3 of the spoiler 14 and the area of the foam mixture inlet 31 is a preferred range, and if the ratio is out of balance, it will cause insufficient foaming, increased resistance, and reduced flow rate. For example, if the area of the spoiler is too small, the foaming will not be sufficient, and if the area is too large, the resistance will be large and the flow rate will be reduced.

In order to install the spoiler 34, the spoiler 34 may be provided with a mounting part 341 for fixing in the foam generating chamber, such as each spoiler 34 shown in FIGS. 5-7.

Of course, the arrangement of the spoiler 34 is not limited to the above, for example, a plurality of spoilers can be arranged, distributed in different positions in the foam generating chamber, and any form of spoiler that can disturb the liquid flow Spoilers are available.

In the present embodiment, the gas-liquid mixing chamber of the gas-liquid mixer 3 is also provided with porous structures 35 such as at least one orifice plate or silk screen arranged at intervals, and each porous structure 35 is provided with a plurality of holes; The holes face the foam mixture inlet 31 and the top of the spoiler 34 is closer to the foam mixture inlet 31 than the porous structure 35 is. The liquid flow broken up by the spoiler 34 rushes from the periphery of the spoiler 34 to the porous structure 35 , and the liquid flow can be further disturbed by the porous structure 35 to make it further mixed.

The application of the external liquefied medium self-expanding foam fire-fighting device provided by the present invention will be described below through specific embodiments.

Example 1

A liquefied medium storage device 2 is used in connection with a foam mixture storage device 1 to protect a gas station.

The liquefied medium storage device 2 has a volume of 40L, stores 32L of liquid nitrogen, and includes a self-pressurizing device. The liquid discharge volume from the liquefied medium storage device 2 to the foam mixture storage device 1 is 0.4-0.8L/S, and the discharge pressure is 0.8MPa. The foam mixed liquid storage device 1 is 400L, the stored foam mixed liquid is 320L, the foam mixed liquid injection flow rate to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6MPa. The diameter of the foam mixture inlet 31 of the gas-liquid mixer 3 is 200mm, and only one liquefied gas inlet 32 is established, and its diameter is 33mm. The area ratio of the foam mixture inlet 31 and the liquefied gas inlet 32 is 36, and the foam of the gas-liquid mixer The diameter of the outlet 33 is 400 mm, and the expansion ratio of the foam is 7.1.

Example 2

A liquefied medium storage device 2 is used in connection with a foam mixture storage device 1 to protect a gas station.

The liquefied medium storage device 2 has a volume of 40L, stores 32L of liquid nitrogen, and includes a self-pressurizing device. The liquid discharge volume from the liquefied medium storage device 2 to the foam mixture storage device 1 is 0.4-0.8L/S, and the discharge pressure is 0.8MPa. The foam mixed liquid storage device 1 is 400L, the stored foam mixed liquid is 320L, the foam mixed liquid injection flow rate to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6MPa. The diameter of the foam mixture inlet 31 of the gas-liquid mixer 3 is 200 mm, and three liquefied gas inlets 32 are established. The diameter of each liquefied gas inlet 32 is 19 mm, and the area ratio of the foam mixture inlet 31 and the liquefied gas inlet 32 is 36. The diameter of the foam outlet 33 of the liquid mixer 3 is 400mm, and the foam expansion ratio is 7.3.

Example 3

The liquefied medium storage device 2 is used in connection with a foam mixture storage device 1 to protect a gas station.

The liquefied medium storage device 2 has a volume of 40L, stores 32L of liquid nitrogen, and includes a self-pressurizing device. The liquid discharge volume from the liquefied medium storage device 2 to the foam mixture storage device 1 is 0.4-0.8L/S, and the discharge pressure is 0.8MPa. The foam mixed liquid storage device 1 is 400L, the stored foam mixed liquid is 320L, the foam mixed liquid injection flow rate to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6MPa. The diameter of the foam mixture inlet 31 of the gas-liquid mixer 3 is 200mm, and only one liquefied gas inlet 32 is established, and its diameter is 63mm. The area ratio of the foam mixture inlet 31 and the liquefied gas inlet 32 is 10, and the gas-liquid mixer 3 The foam outlet 33 diameter is 400mm, and the foam expansion ratio is 5.5.

Example 4

A liquefied medium storage device 2 is used in connection with a foam mixture storage device 1 to protect a gas station.

The liquefied medium storage device 2 has a volume of 40L, stores 32L of liquid nitrogen, and includes a self-pressurizing device. The liquid discharge volume of the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the discharge pressure is 0.8MPa. The foam mixed liquid storage device 1 is 400L, the stored foam mixed liquid is 320L, the foam mixed liquid injection flow rate to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6MPa. The diameter of the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is 200mm, only one liquefied gas inlet 32 is established, and its diameter is 23mm, and the area ratio of the foam mixed liquid inlet 31 and the liquefied gas inlet 32 is 75, the gas-liquid mixer 3 The diameter of the foam outlet 33 is 400mm, and the foam expansion ratio is 4.5.

Example 5

A liquefied medium storage device 2 is used in connection with a foam mixture storage device 1 to protect a gas station.

The liquefied medium storage device 2 has a volume of 40L, stores 32L of liquid nitrogen, and includes a self-pressurizing device. The liquid discharge volume from the liquefied medium storage device 2 to the foam mixture storage device 1 is 0.4-0.8L/S, and the discharge pressure is 0.8MPa. The foam mixed liquid storage device 1 is 400L, and the stored foam mixed liquid is 320L. The predetermined flow rate of the foam mixed liquid sprayed to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.3MPa. The diameter of the foam mixture inlet 31 of the gas-liquid mixer 3 is 200mm, and only one liquefied gas inlet 32 is established, and its diameter is 33mm. The area ratio of the foam mixture inlet 31 and the liquefied gas inlet 32 is 36, and the gas-liquid mixer 3 The diameter of the foam outlet 33 is 400mm, the foam expansion ratio is 5.8, and the actual flow rate is only 2.9L/s, which is lower than the predetermined flow rate of 4L/s.

Example 6

A liquefied medium storage device 2 is used in connection with a foam mixture storage device 1 to protect a gas station.

The liquefied medium storage device 2 has a volume of 40L, stores 32L of liquid nitrogen, and includes a self-pressurizing device. The liquid discharge volume of the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the discharge pressure is 1.5MPa. The foam mixed liquid storage device 1 is 400L, and the stored foam mixed liquid is 320L. The predetermined flow rate of the foam mixed liquid sprayed to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 1.3MPa. The diameter of the foam mixture inlet 31 of the gas-liquid mixer 3 is 200mm, and only one liquefied gas inlet 32 is established, and its diameter is 33mm. The area ratio of the foam mixture inlet 31 and the liquefied gas inlet 32 is 36, and the gas-liquid mixer 3 The diameter of the foam outlet 33 is 400mm, the foam expansion ratio is 7.0, the actual flow rate is only 6.2L/s, which is higher than the predetermined flow rate of 4L/s, and the injection duration is shortened.

Example 7

One liquefied medium storage device 2 is used in connection with six foam mixture storage devices 1 to protect a production device area.

The liquefied medium storage device 2 has a volume of 185L and stores 160L of liquid nitrogen. The liquid discharge volume of the liquefied medium storage device 2 to the foam mixture storage device 1 is 0.8-1.0L/S, and the discharge pressure is 0.8MPa. Each foam mixed liquid storage device 1 is 4000L, and the stored foam mixed liquid is 3400L. The foam mixed liquid injection flow rate to the gas-liquid mixer 3 is 8L/s, and the injection pressure is 0.6MPa. The foam of each gas-liquid mixer 3 The diameter of the mixed liquid inlet 31 is 400 mm, and only one liquefied gas inlet 32 is provided with a diameter of 100 mm. The diameter of the foam outlet 33 of the gas-liquid mixer 3 is 600 mm, and the foam expansion ratio is 6.2.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of specific technical features in any suitable manner. In order to avoid unnecessary repetition, various possible combinations are not further described in the present invention. However, these simple modifications and combinations should also be regarded as the content disclosed by the present invention, and all belong to the protection scope of the present invention.

Claims (16)

1. An external liquefied medium self-expanding foam fire-fighting device, characterized in that the foam fire-fighting device includes a foam mixed liquid storage device (1) for holding the foam mixed liquid and is used to hold the liquefied medium and can A liquefied medium storage device (2) for injecting a liquefied medium into the foam mixed liquid storage device (1); The foam fire-fighting device also includes a gas-liquid mixer (3) with a gas-liquid mixing chamber, and a foam mixture inlet (31), a liquefied gas inlet (32) and a foam outlet (33) are communicated with the gas-liquid mixing chamber. ); Wherein, the foam mixed liquid inlet (31) is used to communicate with the liquid phase of the foam mixed liquid storage device (1) so as to input the foam mixed liquid in the foam mixed liquid storage device (1) into the gas-liquid A mixer (3), the liquefied gas inlet (32) is used to communicate with the gas phase space of the foam mixed liquid storage device (1) for putting the liquefied medium in the foam mixed liquid storage device (1) The liquefied gas produced by internal gasification is input into the gas-liquid mixer (3), and the foam generated by mixing the foam mixture liquid and the liquefied gas in the gas-liquid mixer (3) is discharged from the foam outlet (33 ) ejected. 2. The foam fire-fighting device according to claim 1, characterized in that, the gas-liquid mixer (3) is located outside the foam mixture storage device (1), and the foam mixture inlet (31) and the foam mixture The liquefied gas inlets (32) are respectively connected to the foam mixture storage device (1) through pipelines, and the pipeline between the foam mixture inlet (31) and the foam mixture storage device (1) A second control valve (6) is provided, and a third control valve (7) is provided on the pipeline between the liquefied gas inlet (32) and the foam mixture storage device (1). 3. The foam fire-fighting device according to claim 1, characterized in that, the pipeline between the foam mixed liquid storage device (1) and the liquefied medium storage device (2) is provided with a device for controlling the flow rate of the liquefied medium The first control valve (5) of the foam mixture storage device (1) is provided with a pressure gauge (4) for measuring the pressure in the gas phase space; The foam fire fighting device further includes a control unit, and the control unit adjusts the flow rate of the first control valve (5) according to the pressure of the pressure gauge (4). 4. The foam fire-fighting device according to claim 1, characterized in that, the liquefied medium storage device (2) is provided with one, and the foam mixed liquid storage device (1) is provided with one or more, and the liquefied medium storage device (2) is provided with one or more The medium storage device (2) is connected to one or more of the foam mixture storage devices (1); Alternatively, multiple liquefied medium storage devices (2) are provided, and multiple liquefied medium storage devices (2) are connected together through a confluence pipeline, and the confluence pipeline is connected to one or more foam The mixed liquid storage device (1) is connected. Wherein, each of the foam mixed liquid storage devices (1) is correspondingly provided with one of the gas-liquid mixers (3). 5. The foam fire fighting device according to claim 1, characterized in that the working pressure of the foam mixture storage device (1) is 0.4-1.4Mpa. 6. The foam fire fighting device according to claim 5, characterized in that, the working pressure of the foam mixed liquid storage device (1) is 0.6-1.0Mpa, and the pressure fluctuation of the foam mixed liquid storage device (1) The range is ±0.1Mpa. 7. The foam fire-fighting device according to any one of claims 1-6, characterized in that the liquefied medium storage device (2) is configured such that the stored liquefied medium is pressed into the foam mixture under gas pressure Liquid storage device (1). 8. The foam fire-fighting device according to any one of claims 1-6, characterized in that, one end of the gas-liquid mixer (3) is provided with the foam mixture inlet (31), and the other end is provided with a The foam outlet (33), the liquefied gas inlet (32) is arranged on the side wall between the two ends of the gas-liquid mixer (3). 9. The foam fire-fighting device according to claim 8, characterized in that, the liquefied gas inlet (32) is provided with one or more, and a plurality of the liquefied gas inlets (32) are arranged along the gas-liquid mixer ( 3) The circumferential intervals of the side walls are set. 10. The foam fire fighting device according to claim 8, characterized in that, the relationship between the area S1 of the foam mixture inlet (31) and the area S2 of the liquefied gas inlet (32) is: S1/S2 =10~60; The relationship between the area S4 of the foam outlet (33) and the area S1 of the foam mixture inlet (31) is: S4/S1=1.5-6. 11. The foam fire fighting device according to claim 10, characterized in that the relationship between the area S1 of the foam mixture inlet (31) and the area S2 of the liquefied gas inlet (32) is: S1/S2 =16~40; The relationship between the area S4 of the foam outlet (33) and the area S1 of the foam mixture inlet (31) is: S4/S1=2.5-5. 12. The foam fire-fighting device according to claim 8, characterized in that, a spoiler (34) for disturbing liquid flow is arranged in the gas-liquid mixing chamber of the gas-liquid mixer (3), the The liquefied gas inlet (32) is on the side wall between the spoiler (34) and the foam mixture inlet (31). 13. The foam fire fighting device according to claim 12, characterized in that, the spoiler (34) is formed into a conical structure, a hemispherical structure or a platform structure; The conical top of the conical structure, the spherical top of the hemispherical structure or the platform top of the platform structure faces the foam mixture inlet (31). 14. The foam fire fighting device according to claim 12, characterized in that, the relationship between the maximum cross-section S3 of the spoiler (34) and the area S1 of the foam mixture inlet (31) is: S3 /S1=1.1～3.8. 15. The foam fire fighting device according to claim 13, characterized in that, the relationship between the maximum cross section S3 of the spoiler (34) and the area S1 of the foam mixture inlet (31) is: S3 /S1=1.4～3. 16. The foam fire-fighting device according to claim 12, characterized in that, at least one porous structure (35) arranged at intervals is arranged in the gas-liquid mixing chamber; multiple porous structures (35) are arranged on each holes; the hole of the porous structure (35) is towards the foam mixture inlet (31), and the top of the spoiler (34) is closer to the foam mixture than the porous structure (35) Entrance (31).