CN211245285U - External liquefied medium self-expansion type foam fire-fighting device - Google Patents
External liquefied medium self-expansion type foam fire-fighting device Download PDFInfo
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- CN211245285U CN211245285U CN201820767169.3U CN201820767169U CN211245285U CN 211245285 U CN211245285 U CN 211245285U CN 201820767169 U CN201820767169 U CN 201820767169U CN 211245285 U CN211245285 U CN 211245285U
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Abstract
The utility model discloses an external liquefied medium self-expansion type foam fire-fighting device, which comprises a foam mixed liquid storage device (1) for containing foam mixed liquid and a liquefied medium storage device (2) for containing liquefied medium and injecting the liquefied medium into the foam mixed liquid storage device; the device also comprises a gas-liquid mixer (3) with a gas-liquid mixing cavity, and a foam mixed liquid inlet (31), a liquefied gas inlet (32) and a foam outlet (33) are communicated with the gas-liquid mixing cavity; the foam mixed liquid inlet is used for being communicated with a liquid phase of the foam mixed liquid storage device, the liquefied gas inlet is used for being communicated with a gas phase space of the foam mixed liquid storage device, and foam generated by mixing the foam mixed liquid and the liquefied gas in the gas-liquid mixer is sprayed out from the foam outlet. The utility model provides a foam fire control unit has solved among the prior art that the occupation space that the mode that adopts compressed gas to produce the foam exists is big, need defects such as extra power.
Description
Technical Field
The utility model relates to a technical field puts out a fire, specifically relates to an external liquefaction medium is from expanding type foam fire control unit.
Background
The existing compressed gas foam fire extinguishing mainly adopts a mode of mixing gas and foam mixed liquid to generate foam to extinguish fire. The specific compressed gas foam fire extinguishing mode mainly comprises two modes of normal pressure compressed gas foam fire extinguishing and gas storage type foam fire extinguishing.
The normal pressure type compressed gas foam fire extinguishing generally adopts a compressor or a compressed gas steel cylinder to supply gas, the pressure is basically kept unchanged in the injection process, the gas supply quantity of the compressor and the compressed gas steel cylinder is limited, the requirement of large-flow high-pressure gas supply cannot be met, if the large-flow high-pressure gas supply is required, a plurality of compressors or compressed gas steel cylinders are required to be arranged (for example, a foam fire truck with the flow rate of 150L/S is taken as an example, the supply flow rate of gas is 1050L/S, and the gas supply needs to be supplied by a plurality of large-scale air compressors), the occupied space is large, the arrangement space is often not available in a tank area and a device area, and the field arrangement is not facilitated. Moreover, the foams produced by suction have the following disadvantages: the foam bubbles have different sizes, the foam is not uniform, the performance is unstable, the foam is easy to break, the burning resistance is poor, the fire extinguishing efficiency is not high, and the like.
Another gas storage type foam fire extinguishing usually stores compressed gas in a fire extinguishing agent container, when the compressed gas is sprayed at a large flow, the compressed gas is consumed in a large amount, the spraying pressure is continuously reduced along with the spraying, at the moment, in order to ensure the high-pressure spraying of the fire extinguishing agent, the compressed gas is required to be supplemented into the fire extinguishing agent container in time, and under the large-flow spraying state, the sufficient supplement of the compressed gas cannot be ensured by only an air compressor and a compressed gas steel cylinder, so that the high-pressure spraying requirement cannot be effectively realized, and the fire extinguishing effect is influenced. When a major fire is extinguished, a large flow of foam is required to be produced for extinguishing the fire, the flow of foam mixed liquid is increased at the moment, the gas supply amount of compressed gas is increased, the existing compressed gas foam generation mode cannot realize the supply of large flow of high-pressure compressed gas, the flow of the foam mixed liquid is only 20-30L/s, and the foam mixed liquid is mainly applied to fire suppression on a general scale at present, such as building fire, small-range ground flowing fire and the like, and cannot be applied to large-scale storage device fire or large-scale ground flowing fire. In addition, the existing compressed gas foam generation mode needs additional power to compress gas, and the equipment structure and management operation are complex.
Therefore, a new foam generating method is needed to overcome the defects of the prior art that foam fire extinguishment by compressed gas and foam fire extinguishment by gas storage are adopted.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects that the occupied space is large, extra power is needed and the like in the mode of generating foam by compressed gas in the prior art.
In order to achieve the above object, the present invention provides an external liquefied medium self-expansion type foam fire fighting device, which includes a foam mixed liquid storage device for storing foam mixed liquid and a liquefied medium storage device for storing liquefied medium and being capable of injecting liquefied medium into the foam mixed liquid storage device;
the foam fire fighting device also comprises a gas-liquid mixer with a gas-liquid mixing cavity, and a foam mixed liquid inlet, a liquefied gas inlet and a foam outlet are communicated with the gas-liquid mixing cavity;
the foam mixed liquid inlet is communicated with a liquid phase of the foam mixed liquid storage device to input foam mixed liquid in the foam mixed liquid storage device into the gas-liquid mixer, the liquefied gas inlet is communicated with a gas phase space of the foam mixed liquid storage device to input liquefied gas generated by gasifying the liquefied medium in the foam mixed liquid storage device into the gas-liquid mixer, and foam generated by mixing the foam mixed liquid and 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 mixed liquid storage device, the foam mixed liquid inlet and the liquefied gas inlet are respectively connected with the foam mixed liquid storage device through a pipeline, a second control valve is arranged on the pipeline between the foam mixed liquid inlet and the foam mixed liquid storage device, and a third control valve is arranged on the pipeline between the liquefied gas inlet and the foam mixed liquid storage device.
Preferably, a first control valve for controlling the flow of the liquefied medium is arranged on a pipeline between the foam mixed liquid storage device and the liquefied medium storage device, and a pressure gauge for measuring the pressure in the gas phase space is arranged on the foam mixed liquid storage device;
the foam fire fighting device further comprises a control unit, and the control unit adjusts the flow of the first control valve according to the pressure of the pressure gauge.
Preferably, one liquefied medium storage device is provided, one or more foam mixed liquid storage devices are provided, and the liquefied medium storage device is connected with one or more foam mixed liquid storage devices;
or a plurality of liquefied medium storage devices are arranged, the plurality of liquefied medium storage devices are connected together through a confluence pipeline, and the confluence pipeline is connected with one or more foam mixed liquid storage devices.
Each foam mixed liquid storage device is correspondingly provided with one gas-liquid mixer;
preferably, the working pressure of the foam mixed liquid storage device is 0.4-1.4 Mpa.
Preferably, the working pressure of the foam mixed liquid storage device is 0.6-1.0Mpa, and the pressure fluctuation range of the foam mixed liquid storage device is +/-0.1 Mpa.
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, gas-liquid mixer one end is provided with foam mixed liquid inlet, and the other end is provided with the foam export, liquefied gas inlet sets up on the lateral wall between gas-liquid mixer both ends.
Preferably, the liquefied gas inlet is provided with one or more, and a plurality of the liquefied gas inlets are provided at intervals in the circumferential direction of the side wall of the gas-liquid mixer.
Preferably, the relationship between the area S1 of the foam mixed liquid inlet and the area S2 of the liquefied gas inlet is: S1/S2 is 10-60;
the relationship between the area of the foam outlet S4 and the area of the foam mixture inlet S1 is: S4/S1 is 1.5-6.
Preferably, the relationship between the area S1 of the foam mixed liquid inlet and the area S2 of the liquefied gas inlet is: S1/S2 is 16-40;
the relationship between the area of the foam outlet S4 and the area of the foam mixture inlet S1 is: S4/S1 is 2.5-5.
Preferably, a flow spoiler for disturbing liquid flow is arranged in the gas-liquid mixing cavity of the gas-liquid mixer, and the liquefied gas inlet is arranged on the side wall between the flow spoiler and the foam mixed liquid inlet.
Preferably, the spoiler is formed as a cone structure, a semi-spherical structure or a platform structure;
the top of the cone structure, the top of the sphere of the hemisphere structure or the top of the platform structure face the foam mixed liquid inlet.
Preferably, the relationship between the maximum cross section S3 of the turbulator and the area S1 of the foam mix inlet is: S3/S1 is 1.1-3.8.
Preferably, the relationship between the maximum cross section S3 of the turbulator and the area S1 of the foam mix inlet is: S3/S1 is 1.4-3.
Preferably, at least one porous structure arranged at intervals is arranged in the gas-liquid mixing cavity; each porous structure is provided with a plurality of holes; the pores of the porous structure face the foam mix inlet, and the top of the turbulator is closer to the foam mix inlet than the porous structure.
The utility model provides a technical scheme has avoided adopting the technical route of compressed gas air feed in order to produce the foam among the prior art, the utility model provides a technique is behind the mixed liquid storage device of liquefaction medium input foam, and the liquefaction medium gasifies from the inflation and produces gas, and the mixed liquid storage device internal pressure of foam risees, and gas and the mixed liquid of foam that its gasification inflation produced can enter into gas-liquid mixer internal mixing automatically and produce the foam under gas pressure, do not need extra power, maintain simply, easy operation. Additionally, the utility model provides a technical scheme need be equipped with air compressor machine, compressed gas steel bottle and the big problem of occupation space who leads to when having solved among the prior art adoption compressed gas production foam to and lean on air compressor machine and compressed gas steel bottle can not guarantee compressed gas's capacity replenishment among the prior art, lead to the unable problem that effectively realizes the high-pressure injection requirement.
Drawings
Fig. 1 is a schematic structural diagram of an external liquefied medium self-expansion type foam fire-fighting device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an external liquefied medium self-expansion type foam fire fighting device according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a gas-liquid mixer;
FIG. 4 is a schematic layout of a liquefied gas inlet of a gas-liquid mixer;
FIG. 5 is a schematic view of one configuration of a spoiler;
FIG. 6 is a schematic view of another spoiler construction;
fig. 7 is a schematic diagram of another bypass device.
Description of the reference numerals
1-a foam mixed liquor storage device; 2-a liquefied medium storage device; 3-gas-liquid mixer; 31-foam mixed liquor inlet; 32-liquefied gas inlet; 33-foam outlet; 34-a spoiler; 35-porous structure; 4-a pressure gauge; 5-a first control valve; 6-a second control valve; 7-a third control valve; 8-a fourth control valve; 9-foam sprayer.
Detailed Description
The following describes the embodiments of the present invention in detail. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "vertical," "horizontal," "top," "bottom," "axial," "radial," "circumferential," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The utility model provides an external liquefied medium self-expansion type foam fire fighting device, as shown in figures 1 and 2, the foam fire fighting device comprises a foam mixed liquid storage device 1 for containing foam mixed liquid and a liquefied medium storage device 2 for containing liquefied medium and being capable of injecting the liquefied medium into the foam mixed liquid storage device 1; the foam fire fighting device also comprises a gas-liquid mixer 3 which is arranged outside the foam mixed liquid storage device 1 and is provided with a gas-liquid mixing cavity, and a foam mixed liquid inlet 31, a liquefied gas inlet 32 and a foam outlet 33 are communicated with the gas-liquid mixing cavity;
the foam mixed liquid inlet 31 is used for communicating with the liquid phase of the foam mixed liquid storage device 1 to input the foam mixed liquid in the foam mixed liquid storage device 1 into the gas-liquid mixer 3, the liquefied gas inlet 32 is used for communicating with the gas phase space of the foam mixed liquid storage device 1 to input liquefied gas generated by gasifying liquefied media in the foam mixed liquid storage device 1 into the gas-liquid mixer 3, and foam generated by mixing the foam mixed liquid and the liquefied gas in the gas-liquid mixer 3 is sprayed out from the foam outlet 33.
The utility model provides a technical scheme has avoided adopting the technical route of compressed gas air feed in order to produce the foam among the prior art, the technical scheme of the utility model after mixing liquid storage device 1 with liquefied medium input foam, liquefied medium self-expansion gasification produces gas, and foam mixed liquid storage device 1 internal pressure risees, and gas and the foam mixed liquid that its internal expansion gasification produced can enter into gas-liquid mixer 3 automatically and mix in the production foam under gas pressure, do not need extra power, maintain simply easy to operate.
Additionally, the utility model provides a technical scheme need be equipped with the air compressor machine when having solved to adopt compressed gas to produce the foam among the prior art, the compressed gas steel bottle and the big problem of occupation space who leads to, as long as supply the foam with the liquefied medium and mix liquid storage device 1 continuously, will produce sufficient liquefied gas from the inflation and mix the liquid with the foam and produce the foam to solved and leaned on air compressor machine and compressed gas steel bottle can not guarantee compressed gas's capacity replenishment among the prior art, lead to the unable problem that effectively realizes the high-pressure injection requirement.
The utility model provides an among the technical scheme, preferably, liquefaction medium storage device 2 sets up to the liquefaction medium that is stored and is impressed foam mixed liquid storage device 1 under gas pressure.
When the device is used, the liquefied medium storage device 2 containing liquefied media such as liquid nitrogen or liquid carbon dioxide is communicated with the foam mixed liquid storage device 1, the liquefied medium gas pressure (for example, the pressure generated by the gasification of the liquefied medium itself or other gas pressure) is pushed to enter the foam mixed liquid storage device 1, then the liquefied medium is gasified in the foam mixed liquid storage device 1 to increase the pressure in the foam mixed liquid storage device 1, so that the gasified liquefied gas and foam mixed liquid enter the gas-liquid mixer 3 under the pressure, and the liquefied gas and foam mixed liquid can be mixed and foamed in the gas-liquid mixer 3 and can spray foam.
Make the liquefaction medium get into foam mixed liquid storage device 1 through gas pressure in, can realize automatic foaming better, as long as open the valve for the liquefaction medium in the liquefaction medium storage device 2 gets into foam mixed liquid storage device 1 under the pressure that gas got into or liquefaction medium self gasification produced, can foam automatically, need not extra power.
The utility model discloses in, the foam mixed liquid is mixed the production by the foam stoste of usefulness of putting out a fire and water, and the liquefaction medium can be at least one of liquid nitrogen, liquid carbon dioxide, liquefied inert gas, liquefied halohydrocarbon gas. Since the foam generated by mixing the liquefied medium and the foam mixture is used for extinguishing fire, the type of gas generated by the liquefied medium is limited to gas that is helpful for extinguishing fire, i.e., gas that can suppress and suffocate fire, and does not destroy the foam itself. Generally, liquid nitrogen, which is gasified to a gas at room temperature, is used as the liquefaction medium, and thus the gas can be obtained without additional operations. The liquid nitrogen has little maintenance in the storage process, and is convenient for users to use and manage. In addition, the gasification ratio of the liquid nitrogen is 710 times that of 700-710 times, and the liquid nitrogen in unit volume can be used for foaming the foam mixed liquid by more than 10 times.
In the 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 connected to the foam mixed liquid storage device 1 through a pipeline, respectively. Specifically, the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is connected to the lower side 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 upper side of the foam mixed liquid storage device 1 to communicate with the gas phase space of the foam mixed liquid storage device 1.
A first control valve 5 is provided in a pipeline between the liquefied medium storage device 2 and the foam mixture storage device 1, a second control valve 6 is provided in a pipeline between the foam mixture inlet 31 of the gas-liquid mixer 3 and the foam mixture storage device 1, a third control valve 7 is provided in a pipeline between the liquefied gas inlet 32 and the foam mixture storage device 1, and a control valve (not shown in fig. 1) for controlling opening and closing of the outlet is also provided in the foam outlet 33.
Preferably, a pressure gauge 4 for measuring the pressure in the gas phase space in the tank is arranged on the foam mixed liquid storage device 1. The external liquefied medium self-expansion type foam fire-fighting device also comprises a control unit, wherein the control unit can adjust the flow of the first control valve 5 according to the pressure of the pressure gauge 4, so that the pressure in the foam mixed liquid storage device 1 is ensured to be constant or fluctuate within a certain range.
When the device is in a non-ignition state, the foam mixed liquid storage device 1 is at normal pressure, the valve of the foam outlet 33 of the gas-liquid mixer 3 is in a normally-closed state, the first control valve 5, the second control valve 6 and the third control valve 7 are in a normally-closed state, the valve of the self-pressurization device of the liquefied medium storage device 2 is in an open state, and the gas phase space of the liquefied medium storage device 2 is filled with gas with certain pressure. Wherein the self-pressurization device is a device which is carried by the liquefied medium storage device 2 and is used for assisting the liquefied medium to be gasified, so that higher pressure can be maintained in the liquefied medium storage device 2.
When a fire disaster occurs, the first control valve 5 between the liquefied medium storage device 2 and the foam mixed liquid storage device 1 is opened, the liquefied medium enters the foam mixed liquid storage device 1 under the pushing of pressure gas in a gas phase space of the liquefied medium storage device 2 and is immediately gasified, after the liquefied medium is gasified, the pressure in the gas phase space in the foam mixed liquid storage device 1 continuously rises, after the pressure rises to a preset value, the second control valve 6 and the third control valve 7 are opened, meanwhile, the valve of the foam outlet 33 is also opened, the foam mixed liquid and the liquefied gas are pressed into the gas-liquid mixer 3 through a pipeline to be mixed and foamed, and the foam mixed liquid and the liquefied gas are sprayed out through a foam sprayer of the foam outlet 33. After the injection is finished, the foam mixture is refilled.
Wherein, in the process of injecting the liquefied medium into the foam mixed liquid storage device 1 during fire extinguishing, the pressure in the foam mixed liquid storage device 1 is kept constant, if the pressure in the device is higher than a preset value (according to a pressure gauge 4), the control unit gives an instruction to reduce the opening degree of the first control valve 5 and reduce the flow rate of the liquefied medium, otherwise, the opening degree of the first control valve 5 is increased and the flow rate of the liquefied medium is increased.
The flow rate of the liquefied medium injected therein depends on the size of the gas phase space of the foam mixed liquid storage apparatus 1 and the foam flow rate of the foam outlet 33. The amount of the injected liquefied medium is such that the pressure in the foam mixed liquid storage device 1 is constant or fluctuates within a predetermined range to satisfy the amount required for foaming the foam. The flow rate of the liquefied medium can be adjusted by adjusting the opening degree of the first control valve 5 by the control unit. Wherein 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 +/-0.1 MPa. The working pressure is the pressure in the foam mixed liquid storage device 1 when the foam fire fighting device generates foam.
The foam fire fighting device provided by the utility model has simple operation when extinguishing fire, and after the fire condition is confirmed, the first control valve 5 and the pipeline valve of the corresponding fire area can be manually opened; automatic valves can be arranged on each pipeline for remote starting; if the protection area is provided with fire monitoring equipment, the monitoring equipment can be linked with the foam fire-fighting device, namely, the automatic control valve is controlled to be automatically opened when the fire monitoring equipment monitors a fire, the liquefied medium in the liquefied medium storage device 2 automatically enters the foam mixed liquid storage device 1 under the gas pressure, and then the liquefied gas and the foam mixed liquid in the foam mixed liquid storage device 1 enter the gas-liquid mixer 3 to be mixed and foamed, so that the automatic starting of foam fire extinguishing can be realized.
The utility model provides an among the technical scheme, a liquefaction medium storage device 2 can be connected with the mixed liquid storage device 1 of a foam, also can be connected with the mixed liquid storage device 1 of a plurality of foams. Fig. 1 shows an embodiment in which one liquefied medium storage device 2 can be connected to one foam mixture storage device 1, and fig. 2 shows an embodiment in which one liquefied medium storage device 2 is connected to a plurality of foam mixture storage devices 1.
As shown in fig. 2, one liquefied medium storage device 2 is provided, there are a plurality of foam mixed liquid storage devices 1, and the liquefied medium storage devices 2 are respectively connected to the plurality of foam mixed liquid storage devices 1 to supply liquefied medium to the plurality of foam mixed liquid storage devices 1; each of the foam mixture storage devices 1 is provided with a gas-liquid mixer 3 (the connection between the foam mixture storage device 1 and the gas-liquid mixer 3 is not shown in fig. 2, which may be the connection shown in fig. 1). A foam sprayer 9 may be connected to the foam outlet 33 of each gas-liquid mixer 3 to facilitate the spraying of foam. Further, a first control valve 5 is provided on the main pipe between the liquefied medium storage apparatus 2 and the foam mixed liquid storage apparatus 1, and a fourth control valve 8 is provided on each branch pipe to control the flow rate of the liquefied medium to each foam mixed liquid storage apparatus 1.
In addition, a plurality of liquefied medium storage devices 2 may be provided to achieve continuous supply of liquefied medium, and the plurality of liquefied medium storage devices 2 are connected together by a confluence pipeline, and the confluence pipeline is connected with one or more foam mixed liquid storage devices 1. Similarly, each foam mixture storage device 1 is correspondingly provided with a gas-liquid mixer 3.
The specific structure of the lower gas-liquid mixer 3 is described in detail below.
As shown in fig. 3, in the present embodiment, the gas-liquid mixer 3 is provided with a foam mixture inlet 31 at one end and a foam outlet 33 at the other end, and a liquefied gas inlet 32 is provided in a side wall between both ends of the gas-liquid mixer 3. Preferably, the gas-liquid mixer 3 has a cylindrical structure or a square cylindrical structure, the foam mixture inlet 31 is provided at one end of the cylindrical structure, and the foam outlet 33 is provided at the other end of the cylindrical structure.
The liquefied gas inlet 32 may be provided in one or more number, and in the case of providing a plurality of liquefied gas inlets 32, a plurality of liquefied gas inlets 32 are provided at intervals in the circumferential direction of the side wall of the gas-liquid mixer 3 (as shown in fig. 4). A plurality of foam mixture liquid inlets 31 and foam outlets 33 may be provided, and the arrangement of the ports is not limited to that in the present embodiment.
Preferably, the relationship between the area S1 of the foam mixed liquid inlet 31 and the area S2 of the liquefied gas inlet 32 is: S1/S2 is 10-60; the relationship between the area S4 of the foam outlet 33 and the area S1 of the foam mixed liquid inlet 31 is: S4/S1 is 1.5-6.
More preferably, the relationship between the area S1 of the foam mixed liquid inlet 31 and the area S2 of the liquefied gas inlet 32 is: S1/S2 is 16-40; the relationship between the area S4 of the foam outlet 33 and the area S1 of the foam mixed liquid inlet 31 is: S4/S1 is 2.5-5. The area proportional relation of each port is controlled, so that the flow relation of each port is controlled, the foaming is more sufficient, and the foam with higher quality is obtained. Here, the area of each port is the total area, and for example, the area of the liquefied gas inlet 32 is the total area of the plurality of liquefied gas inlets 32.
In the present embodiment, a turbulence generator 34 for disturbing a liquid flow is provided in the gas-liquid mixing chamber of the gas-liquid mixer 3 so that the foam mixture liquid and the liquefied gas are sufficiently mixed. Preferably, the liquefied gas inlet 32 is on the side wall between the spoiler 34 and the foam mixed liquid inlet 31.
Wherein the turbulence generator 34 may be formed as a conical structure (see fig. 5), a hemispherical structure (see fig. 6), or a plateau structure (see fig. 7), or other irregularly shaped structure, with the conical apex of the conical structure, the spherical apex of the hemispherical structure, or the plateau top surface of the plateau structure facing the foam mix inlet 31. The spoiler 34 is installed such that the top thereof faces the foam mixed liquid inlet 31, and the fluid mixed with the liquefied gas and the foam mixed liquid is flushed toward the spoiler 34, which facilitates the sufficient mixing of the liquefied medium and the foam mixed liquid to obtain foam with uniform foaming and good performance.
Preferably, the relationship between the maximum cross section S3 of the vortex generator 34 and the area S1 of the foam mix inlet 31 is: S3/S1 is 1.1-3.8, and more preferably S3/S1 is 1.4-3.
The ratio of the area S3 of the spoiler 14 to the area of the foam mixture inlet 31 is a preferable range, and if the ratio is out of balance, the foam foaming is insufficient, the resistance is increased, and the flow rate is decreased. For example, if the area of the spoiler is too small, foaming is insufficient, and if the area is too large, resistance is large, and the flow rate is reduced.
To install the spoiler 34, the spoiler 34 may be provided with an installation portion 341 for fixing in the foam generating chamber, such as each spoiler 34 shown in fig. 5 to 7.
Of course, the arrangement of the turbulence generator 34 is not limited to the above, for example, a plurality of turbulence generators may be arranged and distributed at different positions in the foam generating chamber, and any type of turbulence generator capable of disturbing the flow of liquid may be used.
In this embodiment, at least one porous structure 35 such as a perforated plate or a wire mesh and the like arranged at intervals is further arranged in the gas-liquid mixing cavity of the gas-liquid mixer 3, and each porous structure 35 is provided with a plurality of holes; the pores of the porous structure 35 face the foam mix inlet 31, and the top of the turbulator 34 is closer to the foam mix inlet 31 than the porous structure 35. The liquid flow broken up by the turbulence generator 34 is directed from the periphery of the turbulence generator 34 to the porous structure 35, and the liquid flow is further disturbed by the porous structure 35 to be further mixed.
The application of the external liquefied medium self-expansion type foam fire fighting device provided by the invention is described below by the specific implementation mode.
Example 1
A liquefied medium storage device 2 is connected with a foam mixture storage device 1 for use in protecting a gas station.
The capacity of the liquefied medium storage device 2 is 40L, the liquefied medium storage device stores 32L of liquid nitrogen, the self-pressurization device is included, the liquid discharge amount from the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the liquid discharge pressure is 0.8 MPa. The foam mixed liquid storage device 1 is 400L, the foam mixed liquid is stored to be 320L, the injection flow of the foam mixed liquid to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6 MPa. The diameter of the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is 200mm, only one liquefied gas inlet 32 is provided, the diameter is 33mm, the area ratio of the foam mixed liquid inlet 31 to the liquefied gas inlet 32 is 36, the diameter of the foam outlet 33 of the gas-liquid mixer is 400mm, and the foam expansion ratio is 7.1.
Example 2
A liquefied medium storage device 2 is connected with a foam mixture storage device 1 for use in protecting a gas station.
The capacity of the liquefied medium storage device 2 is 40L, the liquefied medium storage device stores 32L of liquid nitrogen, the self-pressurization device is included, the liquid discharge amount from the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the liquid discharge pressure is 0.8 MPa. The foam mixed liquid storage device 1 is 400L, the foam mixed liquid is stored to be 320L, the injection flow of the foam mixed liquid to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6 MPa. The diameter of the foam mixture inlet 31 of the gas-liquid mixer 3 is 200mm, 3 liquefied gas inlets 32 are provided, the diameter of each liquefied gas inlet 32 is 19mm, the area ratio of the foam mixture inlet 31 to the liquefied gas inlet 32 is 36, the diameter of the foam outlet 33 of the gas-liquid mixer 3 is 400mm, and the foam expansion ratio is 7.3.
Example 3
The liquefied medium storage device 2 is connected with a foam mixed liquid storage device 1 for use and is used for protecting a gas station.
The capacity of the liquefied medium storage device 2 is 40L, the liquefied medium storage device stores 32L of liquid nitrogen, the self-pressurization device is included, the liquid discharge amount from the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the liquid discharge pressure is 0.8 MPa. The foam mixed liquid storage device 1 is 400L, the foam mixed liquid is stored to be 320L, the injection flow of the foam mixed liquid to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6 MPa. The diameter of the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is 200mm, only one liquefied gas inlet 32 is provided, the diameter is 63mm, the area ratio of the foam mixed liquid inlet 31 to the liquefied gas inlet 32 is 10, the diameter of the foam outlet 33 of the gas-liquid mixer 3 is 400mm, and the foam expansion ratio is 5.5.
Example 4
A liquefied medium storage device 2 is connected with a foam mixture storage device 1 for use in protecting a gas station.
The capacity of the liquefied medium storage device 2 is 40L, the liquefied medium storage device stores 32L of liquid nitrogen, the self-pressurization device is included, the liquid discharge amount of the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the liquid discharge pressure is 0.8 MPa. The foam mixed liquid storage device 1 is 400L, the foam mixed liquid is stored to be 320L, the injection flow of the foam mixed liquid to the gas-liquid mixer 3 is 4L/s, and the injection pressure is 0.6 MPa. The diameter of the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is 200mm, only one liquefied gas inlet 32 is provided, the diameter is 23mm, the area ratio of the foam mixed liquid inlet 31 to the liquefied gas inlet 32 is 75, the diameter of the foam outlet 33 of the gas-liquid mixer 3 is 400mm, and the foam expansion ratio is 4.5.
Example 5
A liquefied medium storage device 2 is connected with a foam mixture storage device 1 for use in protecting a gas station.
The capacity of the liquefied medium storage device 2 is 40L, the liquefied medium storage device stores 32L of liquid nitrogen, the self-pressurization device is included, the liquid discharge amount from the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the liquid discharge pressure is 0.8 MPa. The foam mixed liquid storage device 1 is 400L, the foam mixed liquid is stored as 320L, the preset flow rate of the foam mixed liquid sprayed to the gas-liquid mixer 3 is 4L/s, and the spraying pressure is 0.3 MPa. The diameter of the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is 200mm, only one liquefied gas inlet 32 is arranged, the diameter is 33mm, the area ratio of the foam mixed liquid inlet 31 to the liquefied gas inlet 32 is 36, the diameter of the foam outlet 33 of the gas-liquid mixer 3 is 400mm, the foam expansion is 5.8, the actual flow rate is only 2.9L/s and is lower than 4L/s of the preset flow rate.
Example 6
A liquefied medium storage device 2 is connected with a foam mixture storage device 1 for use in protecting a gas station.
The capacity of the liquefied medium storage device 2 is 40L, the liquefied medium storage device stores 32L of liquid nitrogen, the self-pressurization device is included, the liquid discharge amount of the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.4-0.8L/S, and the liquid discharge pressure is 1.5 MPa. The foam mixed liquid storage device 1 is 400L, the foam mixed liquid is stored to be 320L, the preset flow of the foam mixed liquid sprayed to the gas-liquid mixer 3 is 4L/s, and the spraying pressure is 1.3 MPa. The diameter of the foam mixed liquid inlet 31 of the gas-liquid mixer 3 is 200mm, only one liquefied gas inlet 32 is arranged, the diameter is 33mm, the area ratio of the foam mixed liquid inlet 31 to the liquefied gas inlet 32 is 36, the diameter of the foam outlet 33 of the gas-liquid mixer 3 is 400mm, the foam expansion ratio is 7.0, the actual flow rate is only 6.2L/s and is higher than 4L/s of the preset flow rate, and the spraying duration is shortened.
Example 7
A liquefied medium storage device 2 is connected with 6 foam mixed liquid storage devices 1 for use, and is used for protecting a production device area.
The capacity of the liquefied medium storage device 2 is 185L, the liquid nitrogen is stored by 160L, the liquid discharge amount of the liquefied medium storage device 2 to the foam mixed liquid storage device 1 is 0.8-1.0L/S, and the liquid discharge pressure is 0.8 MPa. Each foam mixed liquid storage device 1 is 4000L, the stored foam mixed liquid is 3400L, the foam mixed liquid injection flow to the gas-liquid mixer 3 is 8L/s, the injection pressure is 0.6MPa, the diameter of a foam mixed liquid inlet 31 of each gas-liquid mixer 3 is 400mm, only one liquefied gas inlet 32 is arranged, the diameter of the liquefied gas inlet is 100mm, the diameter of a foam outlet 33 of each gas-liquid mixer 3 is 600mm, and the foam expansion ratio is 6.2.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, makes up with any suitable mode including each concrete technical feature. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (14)
1. An external liquefied medium self-expansion type foam fire fighting device is characterized by comprising a foam mixed liquid storage device (1) for containing foam mixed liquid and a liquefied medium storage device (2) for containing liquefied medium and injecting the liquefied medium into the foam mixed liquid storage device (1);
the foam fire-fighting device also comprises a gas-liquid mixer (3) with a gas-liquid mixing cavity, and a foam mixed liquid inlet (31), a liquefied gas inlet (32) and a foam outlet (33) are communicated with the gas-liquid mixing cavity;
wherein the foam mixed liquid inlet (31) is used for being communicated with a 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), the liquefied gas inlet (32) is used for being communicated with a gas phase space of the foam mixed liquid storage device (1) so as to input liquefied gas generated by the gasification of the liquefied medium in the foam mixed liquid storage device (1) into the gas-liquid mixer (3), and foam generated by the mixing of the foam mixed liquid and the liquefied gas in the gas-liquid mixer (3) is sprayed out from the foam outlet (33);
the gas-liquid mixer (3) is positioned outside the foam mixed liquid storage device (1).
2. The foam fire fighting device according to claim 1, wherein the foam mixed liquid inlet (31) and the liquefied gas inlet (32) are connected to the foam mixed liquid storage device (1) through a pipeline, respectively, and a second control valve (6) is provided on the pipeline between the foam mixed liquid inlet (31) and the foam mixed liquid storage device (1), and a third control valve (7) is provided on the pipeline between the liquefied gas inlet (32) and the foam mixed liquid storage device (1).
3. The foam fire fighting device according to claim 1, wherein a first control valve (5) for controlling the flow of the liquefied medium is provided on a pipeline between the foam mixture storage device (1) and the liquefied medium storage device (2), and a pressure gauge (4) for measuring the pressure in the gas phase space is provided on the foam mixture storage device (1);
the foam fire fighting device further comprises a control unit, and the control unit adjusts the flow of the first control valve (5) according to the pressure of the pressure gauge (4).
4. Foam fire fighting unit according to claim 1, characterized in that one liquefied medium storage unit (2) is provided, one or more foam mixture storage units (1) are provided, and the liquefied medium storage unit (2) is connected to one or more foam mixture storage units (1);
or a plurality of liquefied medium storage devices (2) are arranged, the plurality of liquefied medium storage devices (2) are connected together through a confluence pipeline, and the confluence pipeline is connected with one or a plurality of foam mixed liquid storage devices (1);
wherein, each foam mixed liquid storage device (1) is correspondingly provided with one gas-liquid mixer (3).
5. Foam fire fighting unit according to any of claims 1 to 4, characterized in that the liquefied medium storage unit (2) is arranged such that the stored liquefied medium is pressed into the foam mixture storage unit (1) under gas pressure.
6. The foam fire fighting device according to any of claims 1 to 4, wherein the gas-liquid mixer (3) is provided with the foam mixture inlet (31) at one end and the foam outlet (33) at the other end, and the liquefied gas inlet (32) is provided on a side wall between both ends of the gas-liquid mixer (3).
7. The foam fire fighting unit according to claim 6, wherein the liquefied gas inlets (32) are provided in one or more number, and a plurality of the liquefied gas inlets (32) are provided at intervals in the circumferential direction of the side wall of the gas-liquid mixer (3).
8. The foam fire fighting device of claim 6, wherein the relationship between the area S1 of the foam mixed liquid inlet (31) and the area S2 of the liquefied gas inlet (32) is: S1/S2 is 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 is 1.5-6.
9. The foam fire fighting device of claim 8, wherein the relationship between the area S1 of the foam mixed liquid inlet (31) and the area S2 of the liquefied gas inlet (32) is: S1/S2 is 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 is 2.5-5.
10. The foam fire fighting unit according to claim 6, characterized in that a flow spoiler (34) for disturbing a liquid flow is provided in the gas-liquid mixing chamber of the gas-liquid mixer (3), the liquefied gas inlet (32) being on a side wall between the flow spoiler (34) and the foam mixed liquid inlet (31).
11. The foam fire fighting unit of claim 10, wherein the spoiler (34) is formed as a cone structure, a semi-spherical structure or a platform structure;
the conical top of the conical structure, the spherical top of the hemispherical structure or the top surface of the platform structure faces the foam mixed liquid inlet (31).
12. The foam fire fighting device of claim 10, wherein the relationship between the maximum cross section S3 of the spoiler (34) and the area S1 of the foam mix inlet (31) is: S3/S1 is 1.1-3.8.
13. The foam fire fighting device of claim 11, wherein the relationship between the maximum cross section S3 of the spoiler (34) and the area S1 of the foam mix inlet (31) is: S3/S1 is 1.4-3.
14. The foam fire fighting unit of claim 10, wherein at least one spaced apart porous structure (35) is provided in the gas-liquid mixing chamber; a plurality of holes are arranged on each porous structure (35); the pores of the porous structure (35) are directed towards the foam mix inlet (31) and the top of the turbulator (34) is closer to the foam mix inlet (31) than the porous structure (35).
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| CN201820767169.3U CN211245285U (en) | 2018-05-22 | 2018-05-22 | External liquefied medium self-expansion type foam fire-fighting device |
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| CN201820767169.3U CN211245285U (en) | 2018-05-22 | 2018-05-22 | External liquefied medium self-expansion type foam fire-fighting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110507932A (en) * | 2018-05-22 | 2019-11-29 | 中国石油化工股份有限公司 | External liquefied medium self-expansion type foam fire fighting equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110507932A (en) * | 2018-05-22 | 2019-11-29 | 中国石油化工股份有限公司 | External liquefied medium self-expansion type foam fire fighting equipment |
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