CN116999740A - Low-pressure liquefied gas foam fire extinguishing system - Google Patents
Low-pressure liquefied gas foam fire extinguishing system Download PDFInfo
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- CN116999740A CN116999740A CN202310932971.9A CN202310932971A CN116999740A CN 116999740 A CN116999740 A CN 116999740A CN 202310932971 A CN202310932971 A CN 202310932971A CN 116999740 A CN116999740 A CN 116999740A
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- foam
- liquefied gas
- pressure liquefied
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- 239000006260 foam Substances 0.000 title claims abstract description 252
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 238000005187 foaming Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000007865 diluting Methods 0.000 claims description 15
- 230000004087 circulation Effects 0.000 claims description 14
- 229920006395 saturated elastomer Polymers 0.000 claims description 12
- WVSNNWIIMPNRDB-UHFFFAOYSA-N 1,1,1,3,3,4,4,5,5,6,6,6-dodecafluorohexan-2-one Chemical compound FC(F)(F)C(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F WVSNNWIIMPNRDB-UHFFFAOYSA-N 0.000 claims description 5
- NSGXIBWMJZWTPY-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropane Chemical compound FC(F)(F)CC(F)(F)F NSGXIBWMJZWTPY-UHFFFAOYSA-N 0.000 claims description 4
- UKACHOXRXFQJFN-UHFFFAOYSA-N heptafluoropropane Chemical compound FC(F)C(F)(F)C(F)(F)F UKACHOXRXFQJFN-UHFFFAOYSA-N 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims 10
- 239000007789 gas Substances 0.000 description 158
- 239000012071 phase Substances 0.000 description 14
- 230000006872 improvement Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 239000007791 liquid phase Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000007792 gaseous phase Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QQZOPKMRPOGIEB-UHFFFAOYSA-N 2-Oxohexane Chemical class CCCCC(C)=O QQZOPKMRPOGIEB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003836 peripheral circulation Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/12—Nozzles specially adapted for fire-extinguishing for delivering foam or atomised foam
Abstract
The application relates to the field of fire-fighting equipment, in particular to a low-pressure liquefied gas foam fire-extinguishing system, which comprises a foam mixed liquid supply device, a low-pressure liquefied gas supply device, a gas foam mixing device, a compressed gas foam generator and a foam generating device, wherein the foam mixed liquid supply device and the low-pressure liquefied gas supply device are respectively connected with the gas foam mixing device, the compressed gas foam generator and the foam generating device are sequentially connected, and the compressed gas foam generator is used for mixing and stirring the foam mixed liquid and the low-pressure liquefied gas to foam. The application adopts low-pressure liquefied gas as gas phase, and the compressed gas foam generator is arranged at the front end of the foam generating device for pre-foaming, so that the obtained foam is fine and compact, and has good stability, high foaming multiple and good coverage.
Description
Technical Field
The application relates to the field of fire-fighting equipment, in particular to a low-pressure liquefied gas foam fire-extinguishing system.
Background
The foam fire extinguisher is common fire-fighting equipment, and is more conventional a compressed air foam fire extinguisher, and conventional air foam is usually mixed and foamed with air under standard working conditions (one atmosphere), and is mixed with air under standard working conditions whether venturi negative pressure sucks air under standard working conditions or foam after jet flow. The compressed air foam is foamed before the foam is sprayed out of the foam generating device, and the foam is mixed and foamed with gas with higher than standard atmospheric pressure, but the common compressed air foam (comprising nitrogen, carbon dioxide and the like) has a gaseous state at the mixing point of the foam and the gaseous phase, so that the mixing of the foam and the gaseous phase is the mixing of a liquid state and a gaseous state medium, the problem of uneven mixing of the gas and the foam liquid is easy to exist, the spraying process is gradually reduced, the state of the foam is changed, the foaming performance of the sprayed foam is unstable, and stable and fine foam is not easy to form. In addition, the gas-liquid two-phase flow is adopted in the conveying process, the gas-phase pressure, the volume and the like are changed due to the change of the section pressure in the conveying process, and the conveying process is very complex.
Disclosure of Invention
The application provides a low-pressure liquefied gas foam fire extinguishing system, which aims to solve the problems that the foam foaming performance of the existing compressed air foam fire extinguisher is unstable and stable and fine foam is not easy to form.
The application provides equipment for testing high-voltage compatibility, which adopts the following technical scheme:
the low-pressure liquefied gas foam fire extinguishing system comprises a foam mixed liquid supply device, a low-pressure liquefied gas supply device, a gas foam mixing device, a compressed gas foam generator and a foam generating device, wherein the foam mixed liquid supply device and the low-pressure liquefied gas supply device are respectively connected with the gas foam mixing device, the compressed gas foam generator and the foam generating device are sequentially connected, and the compressed gas foam generator is used for mixing and stirring the foam mixed liquid and the low-pressure liquefied gas to foam.
Through adopting above-mentioned technical scheme, adopt low pressure liquefied gas to replace air, nitrogen gas or carbon dioxide as the gaseous phase, place the compressed gas foam generator in foam generating device front end, foam in advance, the compressed gas foam generator is used for making foam mixed liquor mix with low pressure liquefied gas stirring, because mixing stirring produces pressure loss, low pressure liquefied gas changes the gaseous state from liquid to produce compressed gas foam in the compressed gas generator, such foam is fine and smooth and compact, stability is good, the foaming multiple is high, the spreadability is good.
As a further improvement of the above technical solution, the pressure at the inlet end of the compressed gas foam generator is higher than the saturated vapor pressure of the low-pressure liquefied gas, and the pressure at the outlet end of the compressed gas foam generator is lower than the saturated vapor pressure of the low-pressure liquefied gas.
By adopting the technical scheme, the low-pressure liquefied gas is in a liquid state before entering the inlet end of the compressed gas foam generator, and is discharged from the outlet end of the compressed gas foam generator. The pipeline after the low-pressure liquefied gas and the foam mixed liquid are mixed is conveyed into a liquid single-phase flow channel, so that the flow resistance is reduced, and the hydraulic calculation of the pipeline is facilitated.
As a further improvement of the above technical solution, the low-pressure liquefied gas is one or more of perfluoro hexanone, heptafluoropropane and hexafluoropropane.
By adopting the technical scheme, the perfluoro-hexanone, the heptafluoropropane and the hexafluoropropane are all low-pressure liquefied gases with high safety and good fire extinguishing performance.
As a further improvement of the above technical solution, the foam mixed liquid supply device includes a foam liquid storage tank and a foam diluting and mixing device, the foam liquid storage tank is connected with the foam diluting and mixing device, and the foam diluting and mixing device is connected with the gas foam mixing device.
By adopting the technical scheme, the foam mixed liquid is prepared by the foam liquid storage tank and the foam diluting and mixing device, so that the foaming concentration requirement of the foam mixed liquid is met.
As a further improvement of the technical scheme, the compressed gas foam generator comprises a cylinder body, a plurality of inner cylinders are axially arranged in the cylinder body at intervals, one end of each inner cylinder is open, the other end of each inner cylinder is closed, a first through hole is formed in the circumferential wall surface of each inner cylinder, and the opening directions of the inner cylinders are consistent.
By adopting the technical scheme, the mixed medium enters the inner cylinder, and the annular plate blocks the mixed medium from flowing, so that the mixed medium is sprayed outwards from the first through hole after entering the inner cylinder, and the sprayed medium enters the first inner cylinder again and is sprayed in the same mode until passing through the last inner cylinder. The direction of the medium entering the inner cylinder is basically vertical to the direction of the medium sprayed out of the inner cylinder, and the low-pressure liquefied gas is changed from liquid phase to gas phase to foam the foam mixed liquid by changing the flow direction and the flow speed for a plurality of times.
As a further improvement of the technical scheme, the opening end of the inner cylinder is provided with a ring plate, and the ring plate is connected with the inner wall of the cylinder body.
Through adopting above-mentioned technical scheme, the installation of inner tube and barrel is realized to the annular plate, forms simultaneously and blocks for the medium can only get into the inner tube, and spouts from the first through-hole of inner tube.
As a further improvement of the technical scheme, the compressed gas foam generator comprises a cylinder body, a plurality of first baffles and a plurality of second baffles are arranged in the cylinder body, the first baffles and the second baffles are alternately arranged at intervals, the first baffles are arranged on the inner wall of the cylinder body, the second baffles are arranged on the adjacent first baffles, a second through hole is formed in the first baffles, the second through hole faces the second baffles, and a circulation gap is reserved between the second baffles and the inner wall of the cylinder body.
Through adopting above-mentioned technical scheme, mixed medium gets into from the second through-hole of first baffle central point put, spouts perpendicularly to the second baffle at rear to flow to the first baffle of second at rear from peripheral circulation clearance, spout through the second through-hole again, through first baffle and second baffle, make the flow direction of medium change through many times, thereby make low pressure liquefied gas change from liquid phase transition to gaseous phase make foam mixed solution foam.
As a further improvement of the technical scheme, a connecting rod is arranged between two adjacent first baffles, and the second baffles are arranged on the corresponding connecting rods.
By adopting the technical scheme, the connecting rod realizes the non-contact installation of the second baffle and the cylinder body, and ensures the smoothness of the circulation gap.
As a further improvement of the technical scheme, the compressed gas foam generator comprises a cylinder body, a plurality of third baffles are arranged on the inner wall of the cylinder body at intervals, two adjacent third baffles are arranged in a symmetrical and staggered mode, circulation gaps are formed between the third baffles and the inner wall of the cylinder body, and each circulation gap is in S-shaped arrangement.
By adopting the technical scheme, after the mixed medium enters the cylinder, the flowing gap is arranged in an S shape, so that the flow direction of the medium is in an S shape. The adjacent two third baffles are symmetrically arranged in a staggered mode, so that the flow direction of the medium is changed for a plurality of times, and the low-pressure liquefied gas is changed from liquid phase to gas phase to foam the foam mixed liquid.
As a further improvement of the above technical solution, the third baffles are obliquely arranged, and the oblique directions of the third baffles are the same.
Through adopting above-mentioned technical scheme, the third baffle slope sets up, can increase its area of contact, reduces the quantity of third baffle.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the low-pressure liquefied gas is used as a gas phase, the compressed gas foam generator is arranged at the front end of the foam generating device for pre-foaming, the compressed gas foam generator is used for mixing and stirring foam mixed liquid and the low-pressure liquefied gas, the low-pressure liquefied gas is converted from a liquid state to a gas state due to pressure loss generated by mixing and stirring, and compressed gas foam is generated in the compressed gas generator, so that the foam is fine and compact, the stability is good, the foaming multiple is high, and the coverage is good.
2. The pressure of the inlet end of the compressed gas foam generator is higher than the saturated vapor pressure of the low-pressure liquefied gas, and the pressure of the outlet end of the compressed gas foam generator is lower than the saturated vapor pressure of the low-pressure liquefied gas, so that the low-pressure liquefied gas is in a liquid state before entering the inlet end of the compressed gas foam generator and is in a gaseous state from the outlet end of the compressed gas foam generator, so that a pipeline after the low-pressure liquefied gas and the foam mixed liquid are mixed is conveyed into a liquid single-phase runner, the flow resistance is reduced, and the hydraulic calculation of the pipeline is facilitated.
Drawings
Fig. 1 is a schematic structural view of a low pressure liquefied gas foam fire extinguishing system according to embodiment 1 of the present application.
Fig. 2 is a schematic view showing the internal structure of the compressed gas foam generator in example 1 of the present application.
Fig. 3 is a cross-sectional view of the compressed gas foam generator in example 1 of the present application.
Fig. 4 is a schematic structural view of a compressed gas foam generator in example 2 of the present application.
Fig. 5 is a schematic structural view of a compressed gas foam generator in example 3 of the present application.
Fig. 6 is a schematic structural view of a compressed gas foam generator in example 4 of the present application.
Fig. 7 is a schematic structural view of a compressed gas foam generator in example 5 of the present application.
FIG. 8 is a schematic illustration of the connection of various foam generating devices to a compressed gas foam generator in accordance with the present application.
Reference numerals illustrate: 1. a foam mixed liquid supply device; 11. a foam liquid storage tank; 12. foam diluting and mixing device; 2. a low pressure liquefied gas supply device; 3. a gas foam mixing device; 4. a compressed gas foam generator; 40. a baffle; 41. a cylinder; 42. a first baffle; 43. a second baffle; 44. a second through hole; 45. a connecting rod; 46. an inner cylinder; 47. a first through hole; 48. a ring plate; 49. a third baffle; 5. a foam generating device; 6. a flow gap; 7. a delivery line; 81. a metering orifice plate; 82. an interface; 83. a switch; 84. gun head.
Detailed Description
The application is described in further detail below with reference to fig. 1-8.
Example 1
The embodiment of the application discloses a low-pressure liquefied gas foam fire extinguishing system. Referring to fig. 1, the low pressure liquefied gas foam fire extinguishing system includes a foam mixture supply device 1, a low pressure liquefied gas supply device 2, a gas foam mixing device 3, a compressed gas foam generator 4, and a foam generating device 5, wherein the foam mixture supply device 1 and the low pressure liquefied gas supply device 2 are respectively connected with the gas foam mixing device 3 through a conveying pipeline 7, the gas foam mixing device 3 is connected with the compressed gas foam generator 4 through the conveying pipeline 7, and the compressed gas foam generator 4 is connected with the foam generating device 5 through the conveying pipeline 7.
The foam mixed liquid enters the gas foam mixing device 3 from the foam mixed liquid supply device 1, meanwhile, the low-pressure liquefied gas enters the gas foam mixing device 3 from the low-pressure liquefied gas supply device 2, the gas foam mixing device 3 mixes the low-pressure liquefied gas and the foam mixed liquid in proportion, the mixed two mediums enter the compressed gas foam generator 4, the compressed gas foam generator 4 is used for mixing and stirring the foam mixed liquid and the low-pressure liquefied gas, the low-pressure liquefied gas is converted from a liquid state to a gaseous state due to pressure loss caused by mixing and stirring, compressed gas foam is generated in the compressed gas generator, and the generated compressed gas foam is sprayed out by the foam generating device 5. Because the low-pressure liquefied gas is mixed with the foam mixed liquid, and the special compressed gas foam generator 4 is adopted, the foam is fine and compact, the stability is good, the foaming multiple is high, and the coverage is good.
In this embodiment, since the low-pressure liquefied gas is used, the saturated vapor pressure thereof at normal temperature is low, for example, 0.1 to 0.6MPa (gauge pressure), and higher than the saturated vapor pressure, it is in a liquid state, and lower than the saturated vapor pressure, it becomes a gaseous state. The low-pressure liquefied gas foam fire extinguishing system utilizes the characteristic that the mixing and conveying stages of the foam mixed liquid and the gas-phase medium are all liquid single phases, compressed gas foam is generated in the compressed gas foam generator 4, the pressure at the inlet end of the compressed gas foam generator 4 is higher than the saturated vapor pressure of the low-pressure liquefied gas, and the pressure at the outlet end of the compressed gas foam generator 4 is lower than the saturated vapor pressure of the low-pressure liquefied gas.
The low-pressure liquefied gas is one or more of perfluoro-hexanone, heptafluoropropane and hexafluoropropane. In this embodiment, the low pressure liquefied gas is preferably perfluoro-hexanone. The perfluorinated hexanone has the advantages of strong fire extinguishing performance, low toxicity, environmental protection and the like, belongs to liquid at high temperature, and can be safely transported and stored in a normal pressure state by using a common container.
As shown in fig. 1, in the present embodiment, the foam mixed liquid supply apparatus 1 includes a foam liquid storage tank 11 and a foam diluting and mixing apparatus 12, the foam liquid storage tank 11 is connected to the foam diluting and mixing apparatus 12, and the foam diluting and mixing apparatus 12 is connected to the gas foam mixing apparatus 3. After the foam liquid in the foam liquid storage tank 11 enters the foam diluting and mixing device 12, water is added into the foam diluting and mixing device 12 to dilute and mix the foam liquid into foam mixed liquid, and the diluted foam mixed liquid enters the gas foam mixing device 3.
The gas foam mixing device 3 is a proportional mixing device for mixing low-pressure liquefied gas and foam mixed liquid in proportion, and can be of a conventional structure such as a balance type structure and a bag type structure, wherein the mixing ratio of the low-pressure liquefied gas and the foam mixed liquid is mixed according to a certain proportion, and the common range is 7:1 to 15:1 (gas-liquid volume ratio under standard working conditions), in order to make the system have a certain working pressure range, the set pressure of the low-pressure liquefied gas after depressurization is usually higher than a certain value of the foam mixed liquid, such as 0.1 to 1.2MPa. The mixed liquor exiting the mixing device is also a liquid single phase stream.
The compressed gas foam generator 4 is a device for thoroughly stirring and mixing gas and liquid to generate compressed gas foam, and the low-pressure liquefied gas foam is still liquid before entering the inlet of the compressed gas foam generator 4. The purpose of the compressed gas foam generator 4 is to thoroughly mix and agitate the two media, with pressure loss during the process, the low pressure liquefied gas is converted to the gas phase at saturated vapor pressure and the volumetric flow increases with decreasing pressure, the velocity increases, and sufficient energy is available to cause the foam mix to overcome the surface tension and then foam. The foam liquid foamed by the method is fine and compact. The compressed gas foam generator 4 is actually a pre-foaming type, the principle is that the flow direction and the flow rate are changed many times (the through flow sectional area is changed), and the pressure loss needs to be reasonably controlled. As shown in fig. 2 and 3, in the present embodiment, the compressed gas foam generator 4 includes a cylinder 41, in which a plurality of inner cylinders 46 are installed in the cylinder 41 at intervals along the axial direction, one end of the inner cylinder 46 is open and the other end is closed, and in the present embodiment, the number of the inner cylinders 46 is five. The inner cylinder 46 has a plurality of first through holes 47 uniformly distributed on the circumferential wall surface, and the openings of the inner cylinders 46 are aligned. The open end of the inner barrel 46 is an air inlet end. The inner cylinder 46 is arranged coaxially with the cylinder 41, and the opening end of the inner cylinder 46 is provided with a ring plate 48, and the ring plate 48 is fixedly connected with the inner wall of the cylinder 41. An annular baffle 40 is arranged at one end of the inner cylinder 46, which is far away from the annular plate 48, a gap is reserved between the baffle 40 and the cylinder 41, and the baffle 40 can also play a role in changing the flow direction of the medium.
When the mixed medium (low-pressure liquefied gas and foam mixed liquid) in the gas foam mixing device 3 comes out, the mixed medium enters the compressed gas foam generator 4, and enters the first inner cylinder 46 (for example, the first inner cylinder 46 is arranged on the middle left side), and as the ring plate 48 blocks the circulation of the mixed medium, the mixed medium is sprayed outwards from the first through hole 47 after entering the inner cylinder 46, and the sprayed medium enters the second inner cylinder 46 again, and is sprayed in the same way until passing through the last inner cylinder. The direction of medium entering the inner cylinder 46 is basically perpendicular to the direction of the medium sprayed out of the inner cylinder 46, and the low-pressure liquefied gas is changed from liquid phase to gas phase to foam the foam mixed liquid by changing the flow direction and the flow velocity (the aperture of the opening of the inner cylinder 46 is larger than the first through hole 47, and the through flow sectional area is changed to change the flow velocity) for a plurality of times.
The foam generating device 5 is mainly a compressed gas foam generator, a compressed gas foam gun, a fire gun, a foam nozzle and the like, and the gas phase and the liquid phase are mixed and foamed before being sprayed. In this embodiment, the foam generating means 5 is preferably a compressed gas foam generator. The compressed gas foam generator 4 is arranged in front of the compressed gas foam generator (the low-pressure liquefied gas foam generator 4 is arranged in front of the foam generating means 5), as shown in part a of fig. 8. It should be noted that, in fig. 8, part b shows another embodiment of the foam generating device 5 as a fire gun, and part c in fig. 8 shows another embodiment of the foam generating device 5 as a foam gun. In addition to the present embodiment, the foam generating device 5 may have the low-pressure liquefied gas foam generator 4 built therein.
The working principle of the low-pressure liquefied gas foam fire extinguishing system provided by the embodiment of the application is as follows:
after the foam liquid in the foam liquid storage tank 11 enters the foam diluting and mixing device 12, water is added into the foam diluting and mixing device 12 to dilute and mix the foam liquid into foam mixed liquid, and the diluted foam mixed liquid enters the gas foam mixing device 3. Simultaneously, low-pressure liquefied gas enters a gas foam mixing device 3 from a low-pressure liquefied gas supply device 2, the gas foam mixing device 3 mixes the low-pressure liquefied gas and foam mixed liquid in proportion, the mixed two mediums enter a compressed gas foam generator 4 to be mixed and stirred, the low-pressure liquefied gas changes into a gaseous state from a liquid state through multiple changes of flow directions and flow speeds in the compressed gas foam generator 4, compressed gas foam is generated in the compressed gas generator, and the generated compressed gas foam is sprayed out by a foam generating device 5.
Example 2
The low pressure liquefied gas foam fire extinguishing system of this embodiment differs from embodiment 1 only in that:
the structure of the compressed gas foam generator 4 is different from that of embodiment 1. As shown in fig. 4, in the present embodiment, the compressed gas foam generator 4 includes a cylinder 41, in which a plurality of first baffles 42 and a plurality of second baffles 43 are disposed in the cylinder 41, the first baffles 42 and the second baffles 43 are alternately disposed at intervals, the first baffles 42 are preferably five, and the second baffles 43 are preferably four. The first baffle 42 and the second baffle 43 are circular plates. The first baffle 42 is fixed on the inner wall of the cylinder 41, and a second through hole 44 is arranged in the center of the first baffle 42. The second baffle plates 43 are installed on the adjacent first baffle plates 42, specifically, connecting rods 45 are arranged between the two adjacent first baffle plates 42, the second baffle plates 43 are installed on the corresponding connecting rods 45, each connecting rod 45 forms an integral rod, and the integral rods are three. The second through hole 44 is opposite to the second baffle 43, and a flow gap 6 is provided between the second baffle 43 and the inner wall of the cylinder 41. The flow gap 6 is an annular gap, the outer diameter of the first baffle 42 matches the inner diameter of the cylinder 41, and the outer diameter of the second baffle 43 is smaller than the outer diameter of the first baffle 42.
When the mixed medium in the gas foam mixing apparatus 3 comes out and enters the compressed gas foam generator 4, the mixed medium enters from the second through hole 44 of the first baffle plate 42 (the first baffle plate 42 is left in fig. 4), vertically sprays toward the rear second baffle plate 43, flows from the circulation gap 6 toward the rear second baffle plate 42, and sprays again through the second through hole 44, and the above-mentioned process is repeated until flowing out. The flow direction of the medium is changed by a plurality of times by the first baffle 42 and the second baffle 43, so that the low-pressure liquefied gas is changed from the liquid phase to the gas phase to foam the foam mixture.
Example 3
The low pressure liquefied gas foam fire extinguishing system of this embodiment differs from embodiment 2 only in that:
in the present embodiment, as shown in fig. 5, the second baffle plate 43 is connected to the previous first baffle plate 42 by a connecting rod 45, and the connecting rod 45 is segmented, not an entire rod.
The principle is the same as that of embodiment 2, and will not be described here again.
Example 4
The low pressure liquefied gas foam fire extinguishing system of this embodiment differs from embodiment 1 only in that:
as shown in fig. 6, in this embodiment, the compressed gas foam generator 4 includes a cylinder 41, and a plurality of third baffles 49 are disposed on the inner wall of the cylinder 41 at intervals, preferably ten third baffles 49 are disposed, and two adjacent third baffles 49 are disposed in a symmetrical and staggered manner. The third baffle plates 49 are semi-ellipses larger than semi-circles, the flat ends of the third baffle plates 49 pass through the axis of the cylinder 41, the flat ends of two adjacent third baffle plates 49 can be overlapped (seen from the end face), a circulation gap 6 is arranged between the flat ends of the third baffle plates 49 and the inner wall of the cylinder 41, and each circulation gap 6 is in an S-shaped arrangement.
As shown in fig. 6, which shows the state of the upper and lower parts of each third baffle 49, when the mixed medium enters the cylinder 41, passes through the circulation gap 6 below the first third baffle 49 on the left, then sprays to the next second third baffle 49, and passes through the circulation gap 6 above the second third baffle 49 after the medium is changed, sprays to the next third baffle 49, and so on until the medium flows out of the cylinder 41, the circulation gap 6 is arranged in an S shape, so that the flow direction of the medium is in an S shape. The adjacent two third baffles 49 are symmetrically arranged in a staggered manner, so that the flow direction of the medium is changed for a plurality of times, and the low-pressure liquefied gas is changed from liquid phase to gas phase to foam the foam mixed liquid.
Example 5
The low pressure liquefied gas foam fire extinguishing system of this embodiment differs from embodiment 3 only in that:
as shown in fig. 7, in the present embodiment, the third baffles 49 are disposed obliquely, and the oblique directions of the third baffles 49 are the same. The angle of inclination is preferably 45 °.
The inclined arrangement of the third barrier 49 may increase the contact area of the mixed media, thereby reducing the number of barriers, as in the present embodiment, four third barriers 49 are provided.
The principle is the same as that of embodiment 4, and will not be described here again.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. A low pressure liquefied gas foam fire suppression system, characterized by: the foam mixing device comprises a foam mixing liquid supply device (1), a low-pressure liquefied gas supply device (2), a gas foam mixing device (3), a compressed gas foam generator (4) and a foam generating device (5), wherein the foam mixing liquid supply device (1) and the low-pressure liquefied gas supply device (2) are respectively connected with the gas foam mixing device (3), the compressed gas foam generator (4) and the foam generating device (5) are sequentially connected, and the compressed gas foam generator (4) is used for mixing and stirring the foam mixing liquid and the low-pressure liquefied gas for foaming.
2. The low pressure liquefied gas foam fire suppression system according to claim 1, wherein: the pressure of the inlet end of the compressed gas foam generator (4) is higher than the saturated vapor pressure of the low-pressure liquefied gas, and the pressure of the outlet end of the compressed gas foam generator (4) is lower than the saturated vapor pressure of the low-pressure liquefied gas.
3. The low pressure liquefied gas foam fire suppression system according to claim 1, wherein: the low-pressure liquefied gas is one or more of perfluoro-hexanone, heptafluoropropane and hexafluoropropane.
4. A low pressure liquefied gas foam fire suppression system according to any one of claims 1 to 3, wherein: the foam mixed liquid supply device (1) comprises a foam liquid storage tank (11) and a foam diluting and mixing device (12), wherein the foam liquid storage tank (11) is connected with the foam diluting and mixing device (12), and the foam diluting and mixing device (12) is connected with the gas foam mixing device (3).
5. A low pressure liquefied gas foam fire suppression system according to any one of claims 1 to 3, wherein: the compressed gas foam generator (4) comprises a cylinder body (41), a plurality of inner cylinders (46) are axially arranged in the cylinder body (41) at intervals, one ends of the inner cylinders (46) are open, the other ends of the inner cylinders are closed, first through holes (47) are formed in the circumferential wall surface of each inner cylinder (46), and the opening directions of the inner cylinders (46) are consistent.
6. The low pressure liquefied gas foam fire suppression system according to claim 5, wherein: the open end of the inner cylinder (46) is provided with a ring plate (48), and the ring plate (48) is connected with the inner wall of the cylinder body (41).
7. A low pressure liquefied gas foam fire suppression system according to any one of claims 1 to 3, wherein: compressed gas foam generator (4) include barrel (41), be equipped with a plurality of first baffles (42) and a plurality of second baffle (43) in barrel (41), first baffle (42) set up with second baffle (43) interval in turn, first baffle (42) are installed on barrel (41) inner wall, second baffle (43) are installed on adjacent first baffle (42), be equipped with second through-hole (44) on first baffle (42), second through-hole (44) are towards second baffle (43), have circulation clearance (6) between second baffle (43) and the inner wall of barrel (41).
8. The low pressure liquefied gas foam fire suppression system according to claim 7, wherein: a connecting rod (45) is arranged between two adjacent first baffles (42), and the second baffles (43) are arranged on the corresponding connecting rods (45).
9. A low pressure liquefied gas foam fire suppression system according to any one of claims 1 to 3, wherein: the compressed gas foam generator (4) comprises a cylinder body (41), a plurality of third baffles (49) are arranged on the inner wall of the cylinder body (41) at intervals, two adjacent third baffles (49) are arranged in a symmetrical and staggered mode, circulation gaps (6) are formed between the third baffles (49) and the inner wall of the cylinder body (41), and all the circulation gaps (6) are arranged in an S-shaped mode.
10. The low pressure liquefied gas foam fire suppression system according to claim 9, wherein: the third baffles (49) are obliquely arranged, and the oblique directions of the third baffles (49) are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310932971.9A CN116999740A (en) | 2023-07-26 | 2023-07-26 | Low-pressure liquefied gas foam fire extinguishing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310932971.9A CN116999740A (en) | 2023-07-26 | 2023-07-26 | Low-pressure liquefied gas foam fire extinguishing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116999740A true CN116999740A (en) | 2023-11-07 |
Family
ID=88570376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310932971.9A Pending CN116999740A (en) | 2023-07-26 | 2023-07-26 | Low-pressure liquefied gas foam fire extinguishing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116999740A (en) |
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2023
- 2023-07-26 CN CN202310932971.9A patent/CN116999740A/en active Pending
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