CN110975193A - Compressed air foam fluid mixing device - Google Patents
Compressed air foam fluid mixing device Download PDFInfo
- Publication number
- CN110975193A CN110975193A CN201911343789.XA CN201911343789A CN110975193A CN 110975193 A CN110975193 A CN 110975193A CN 201911343789 A CN201911343789 A CN 201911343789A CN 110975193 A CN110975193 A CN 110975193A
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- China
- Prior art keywords
- compressed air
- foam
- mixing chamber
- mixing
- air injection
- Prior art date
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- Granted
Links
- 239000006260 foam Substances 0.000 title claims abstract description 133
- 239000012530 fluid Substances 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 238000002347 injection Methods 0.000 claims description 37
- 239000007924 injection Substances 0.000 claims description 37
- 238000005192 partition Methods 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 28
- 239000012141 concentrate Substances 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000006872 improvement Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 238000005187 foaming Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 210000003437 trachea Anatomy 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Images
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
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Nozzles (AREA)
Abstract
The invention discloses a compressed air foam fluid mixing device which comprises a shell, wherein one end of the shell is provided with a foam liquid inlet, the other end of the shell is provided with a foam outlet, a mixing cavity is arranged in the middle of the shell, foam liquid introduced through the foam liquid inlet enters the mixing cavity, a compressed air introducing component is arranged in the mixing cavity, and the direction of introducing compressed gas in the compressed air introducing component is consistent with the direction of introducing the foam liquid. The invention has the advantages of simple structure, convenient use, good quality of generated foam and the like.
Description
Technical Field
The invention mainly relates to the technical field of fire-fighting equipment, in particular to a compressed air foam fluid mixing device which is mainly suitable for the field of fire-fighting equipment.
Background
The conventional air bubble generator uses the negative pressure principle to suck air to generate bubbles. The mixed liquid of water and foam flows in the pipeline, and air is sucked in to generate foam in the process of being sprayed out by a foam gun or a foam gun. The process that air is sucked into the foam mixed liquid is relatively disordered, the foaming degree of water and the foam extinguishing agent is difficult to reach the optimal state, the foam is not formed uniformly, and even the sprayed mixture contains a lot of water and the foam agent. The utilization rate of water and foam is not high, and the fire extinguishing efficiency is not ideal.
The compressed air foam is formed by actively pressing compressed air into foam mixed liquid directly. It has been found through long-term practice that compressed air directed perpendicularly from the side of the conduit to the foam solution in the mixing chamber results in an asymmetrical flow pattern of the foam solution. The impact of the air on the flow of the foam solution results in unstable flow and velocity of the foam solution, uneven mixing of the foam solution with the air, and both of which can degrade the foamability and uniformity of the compressed air foam.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the compressed air foam fluid mixing device which is simple in structure, convenient to use and good in generated foam quality.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a compressed air foam fluid mixing arrangement, includes the casing, the one end of casing is equipped with the foam concentrate input port, and the other end is equipped with the foam delivery outlet, the middle part inner chamber of casing is the mixing chamber, and the foam concentrate through foam concentrate input port leading-in gets into the mixing chamber, be provided with compressed air leading-in part in the mixing chamber, the leading-in direction of compressed gas in the compressed air leading-in part with the leading-in direction of foam concentrate is unanimous.
As a further improvement of the invention: the mixed intracavity of casing is provided with compressed air and injects the trachea of loosing, compressed air injects to be provided with on the trachea of loosing and lets the reposition of redundant personnel hole that compressed air got into mixed intracavity, compressed air injects the trachea of loosing one end and is provided with the compressed air inlet, and the other end arranges along the leading-in direction of compressed gas.
As a further improvement of the invention: and the foam mixed liquid introduced through the foam liquid inlet enters the mixing cavity along the axial direction of the shell, and one end of the compressed air injection air dispersion pipe, which is far away from the compressed air inlet, is also arranged along the axial direction of the shell.
As a further improvement of the invention: the mixing chamber is divided into more than two mixing chambers.
As a further improvement of the invention: the compressed air injection air-dispersing pipes correspond to more than two mixing chambers, and the compressed air injection air-dispersing pipes in each mixing chamber are provided with shunting holes.
As a further improvement of the invention: the aperture and/or the number of the branch holes of each stage of mixing chamber are the same or different, and the compressed air amount distributed to each mixing chamber is controlled by controlling the aperture and/or the number of the branch holes of each stage.
As a further improvement of the invention: be provided with the mixing chamber baffle between two adjacent mixing chambers, after compressed gas and foam solution mix in a certain mixing chamber, can pass the mixing chamber baffle and get into next mixing chamber.
As a further improvement of the invention: the mixing chamber partition plate is of an umbrella cover type structure, the middle part of the mixing chamber partition plate is sleeved on the compressed air injection air dispersing pipe, a plurality of holes are formed in the panel of the mixing chamber partition plate, and the holes are uniformly formed in the mixing chamber partition plate and used for compressed air and foam solution to be mixed and then to penetrate through.
As a further improvement of the invention: the holes are long strips, and the long strips are arranged along the radial direction of the umbrella cover.
As a further improvement of the invention: the aperture and/or the number of the holes on the partition board of each stage of mixing cavity are the same or different, and the compressed air and the foam solution are uniformly mixed by controlling the aperture and/or the number of the holes of each stage.
As a further improvement of the invention: the compressed air scattering ring is arranged at the position of each shunting hole and is in a horn-mouth structural shape, the middle part of the compressed air scattering ring is sleeved on the compressed air injection air dispersing pipe, and the shunting holes in the compressed air injection air dispersing pipe are located at the position of the horn-mouth on the compressed air scattering ring.
As a further improvement of the invention: a foam liquid scattering baffle ring is arranged on the compressed air injection air dispersing pipe at a position close to a compressed air inlet, and after foam liquid enters from a foam liquid inlet, the foam liquid is scattered through the foam liquid scattering baffle ring and is mixed with compressed air from the flow dividing hole in a mixing cavity to form foam.
As a further improvement of the invention: the foam liquid scattering baffle ring is in a bell-mouthed structural form and is sleeved on a compressed air injection air dispersing pipe, and a shunting hole on the compressed air injection air dispersing pipe is positioned at the bell-mouthed position on the foam liquid scattering baffle ring.
As a further improvement of the invention: the compressed air inlet is a section of independent pipe or is integrated with the compressed air injection air dispersing pipe.
Compared with the prior art, the invention has the advantages that:
1. the compressed air foam fluid mixing device has a simple structure, is convenient to use, and enables compressed air and foam mixed liquid to enter in the same direction, and the design that gas and liquid flow in the same direction in the mixing cavity greatly weakens the impact of air on the foam solution and the pulsation generated by the impact, and is beneficial to the uniform mixing of the foam solution and the compressed air, so that relatively stable two-phase flow is easy to form.
2. The compressed air foam fluid mixing device disclosed by the invention adopts the design of the multistage mixing cavity and the multistage shunting holes, and can greatly improve the mixing effect of compressed air and foam concentrate by matching with the partition plate and the scattering ring, so that the quality of foam is finally improved, and the fire extinguishing effect is enhanced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural diagram of a cross section in a specific application example of the invention.
FIG. 3 is a schematic diagram of a mixing chamber partition in a front view according to the principle of the present invention.
FIG. 4 is a schematic diagram of the structure of the side of the baffle plate of the mixing chamber in a specific application example of the invention.
FIG. 5 is a schematic perspective view of a mixing chamber partition in an embodiment of the present invention.
Fig. 6 is a schematic diagram of a front view structure of a compressed air scattering ring in a specific application example of the invention.
Fig. 7 is a schematic cross-sectional view taken along line a-a in fig. 6.
Fig. 8 is a schematic diagram of the principle of the front view structure of the foam liquid scattering baffle ring in the specific application example of the invention.
Fig. 9 is a schematic cross-sectional view at B-B in fig. 8.
Fig. 10 is a schematic diagram of the structure of the compressed air shunt pipe in the specific application example of the invention.
Fig. 11 is a schematic diagram of the working principle of the invention in a specific application example.
Illustration of the drawings:
100. a foam concentrate inlet; 200. a compressed air input port; 210. 211, the first diversion hole; 212. a second flow dividing orifice; 213. a third tapping hole; 300. a foam liquid scattering baffle ring; 400. a first mixing chamber; 401. a second mixing chamber; 402. a third mixing chamber; 500. a first mixing chamber partition; 501. a second mixing chamber partition; 502. a third mixing chamber partition; 503. an aperture; 600. a first compressed air diffuser ring; 601. a second compressed air diffuser ring; 700. a housing; 800. a foam outlet; 1000. introducing foam liquid; 2000. introducing compressed air; 3000. the flow direction of the foam liquid; 4000. a compressed air flow direction; 5000. primary mixing of foam; 6000. secondary mixing of foam; 7000. mixing the foam for the third time; 8000. the foam was mixed four times.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1 to 11, the compressed air foam fluid mixing device of the present invention includes a housing 700, wherein one end of the housing 700 is provided with a foam liquid input port 100, and the other end is provided with a foam output port 800, and an inner cavity of the middle of the housing 700 is a mixing cavity; the foam mixed liquid introduced through the foam liquid inlet 100 enters the mixing chamber along the axial direction of the shell 700; the invention is provided with the compressed air injection air dispersing pipe 210 in the mixing cavity of the shell 700, the compressed air injection air dispersing pipe 210 is provided with the shunting hole for leading the compressed air to enter the mixing cavity, one end of the compressed air injection air dispersing pipe 210 is provided with the compressed air inlet 200, the other end is arranged along the axial direction of the shell 700, so that the compressed air and the foam mixed liquid enter in the same direction, the design of the gas-liquid two-phase cocurrent flow in the mixing cavity greatly weakens the impact of the air on the foam solution and the pulsation generated by the impact, and is beneficial to the uniform mixing of the foam solution and the compressed air, thereby being easy to form relatively stable two-phase flow.
In a specific application example, the invention is further provided with a foam liquid scattering baffle ring 300 on the compressed air injection diffusing pipe 210 at a position close to the compressed air inlet 200, and after the foam liquid enters from the foam liquid inlet 100, the foam liquid is scattered through the foam liquid scattering baffle ring 300 and mixed with the compressed air from the diversion hole in the mixing cavity, and then foam is formed. Referring to fig. 8 and 9, the foam liquid scattering baffle ring 300 is in a bell-mouthed structure, and is sleeved on the compressed air injection diffuser pipe 210, the diversion holes on the compressed air injection diffuser pipe 210 are located at the bell-mouthed position on the foam liquid scattering baffle ring 300, and the compressed air from the diversion holes can better form scattering at the bell-mouthed position, so that the foam liquid and the compressed air can be better mixed to form finer foam. Therefore, the foam liquid scattering baffle ring 300 has two functions, namely, the first function is to change the flow direction of the foam liquid to form a divergent state by utilizing the horn-shaped appearance; secondly, the compressed air can be in a divergent state by utilizing the diversion holes in the bell mouths of the diversion holes.
In a specific application example, the invention further divides the mixing cavity into more than two mixing cavities, such as the mixing cavity divided into: first mixing chamber 401, second mixing chamber 402, and third mixing chamber 403, it is understood that the number of mixing chambers may be determined according to the length of the whole housing 700, the yield of foam, and the like in practical applications, and this is within the scope of the present invention.
When there are more than two mixing chambers, the compressed air injection dispersion pipe 210 corresponds to the mixing chambers, and the compressed air injection dispersion pipe 210 in each mixing chamber is provided with a branch hole, such as a first branch hole 211, a second branch hole 212, and a third branch hole 213 corresponding to the first mixing chamber 401, the second mixing chamber 402, and the third mixing chamber 403 in the present example. The compressed air can be uniformly mixed with the foam solution when passing through each shunting hole.
In a specific application, the aperture and/or the number of the branch holes of each stage of the mixing chamber may be the same or different. By controlling the aperture and/or the number of each stage of the shunting holes, the compressed air volume of each mixing chamber can be distributed, and the compressed air can be more uniform when entering the mixing chambers.
When having more than two mixing chamber, be provided with the mixing chamber baffle between two adjacent mixing chamber, after compressed gas mixes with the foam solution in a certain mixing chamber, can pass the mixing chamber baffle and get into next mixing chamber. As in this example, a first mixing chamber partition 500 is disposed between the first mixing chamber 401 and the second mixing chamber 402, a second mixing chamber partition 501 is disposed between the second mixing chamber 402 and the third mixing chamber 403, and a third mixing chamber partition 502 is disposed at an outlet end of the third mixing chamber 403 corresponding to the first mixing chamber 401, the second mixing chamber 402, and the third mixing chamber 403.
The mixing chamber partition plate is used for separating adjacent chambers and enabling compressed gas and foam solution to be mixed and then to pass through to enter the next mixing chamber. In this example, referring to fig. 3, 4 and 5, the partition board of the mixing chamber is an umbrella cover type structure, the middle of the partition board is sleeved on the compressed air injection air dispersing pipe 210, a plurality of holes 503 are formed on the panel of the partition board of the mixing chamber, the holes 503 are uniformly formed on the partition board of the mixing chamber for the compressed air and the foam solution to mix and pass through, and the uniform holes 503 can better mix the foam solution and the compressed air again. The shape of the hole 503 can be selected according to actual needs, and can be a strip, a circular hole, an elliptical hole, etc., as long as the actual needs are met. In this embodiment, the hole 503 is a strip, and the strip is opened along the radial direction of the umbrella cover. It is understood that other configurations of the mixing chamber baffle are within the scope of the present invention.
In a specific application, the aperture and/or the number of the holes 503 on each stage of the mixing chamber partition may be the same or different. By controlling the size and/or number of each stage of holes 503, the compressed air and the foaming solution can be mixed more uniformly.
When more than two mixing chambers are provided, referring to fig. 6 and 7, a compressed air scattering ring is disposed at each diversion hole, such as a first compressed air scattering ring 600 and a second compressed air scattering ring 601, the structure of which is substantially the same as that of the foam liquid scattering baffle ring 300, and is also in a bell-mouthed structural form, and the compressed air scattering ring is sleeved on the compressed air injection air dispersing pipe 210, the diversion holes on the compressed air injection air dispersing pipe 210 are located at the bell-mouthed positions on the compressed air scattering ring 210, and the compressed air from the diversion holes can better form scattering at the positions, which is beneficial to better mixing of the foam liquid and the compressed air, and form finer foam.
In a specific application example, the foaming solution inlet 100 is operatively connected to the foaming solution mixing area.
In a specific application example, the compressed air inlet 200 is operatively connected to a compressed air injection diffuser pipe 210. The compressed air inlet 200 may be a separate tube or may be integral with the compressed air injection diffuser 210.
With reference to fig. 11, the sequence in the figure is: introducing foam concentrate 1000, introducing compressed air 2000, introducing foam concentrate flow 3000, compressed air flow 4000, primary mixed foam 5000, secondary mixed foam 6000, tertiary mixed foam 7000 and quaternary mixed foam 8000. The working principle of the invention is as follows: when the technical scheme of the invention is used, taking the example as an example, the foam solution is introduced into the inner cavity of the shell 700 through the foam solution inlet 100, and the compressed air is introduced into the compressed air injection air dispersion pipe 210 through the compressed air inlet 200. In the first mixing chamber 400, compressed air passes through the first split hole 211 and the foam concentrate scattering baffle ring 300, then is mixed with the foam solution, passes through the first mixing chamber partition plate 500, and then enters the second mixing chamber 401; similarly, in the second mixing chamber 401, the compressed air passes through the second diversion hole 212 and then is mixed with the mixed solution from the first mixing chamber 400 again, and then enters the third mixing chamber 402 through the second mixing chamber partition plate 501; in the third mixing chamber 402, the compressed air passes through the third diversion hole 213 and then is mixed with the mixed solution from the second mixing chamber 401 again, and then is sent out after passing through the third mixing chamber partition plate 502; after three times of mixing, more fine and uniform foam is formed and finally is output through a foam output port 800.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (14)
1. The utility model provides a compressed air foam fluid mixing arrangement, includes casing (700), the one end of casing (700) is equipped with foam concentrate input port (100), and the other end is equipped with foam delivery outlet (800), the middle part inner chamber of casing (700) is the hybrid chamber, and the foam concentrate through foam concentrate input port (100) leading-in gets into the hybrid chamber, its characterized in that, be provided with compressed air leading-in part in the hybrid chamber, the leading-in direction of compressed gas in the compressed air leading-in part with the leading-in direction of foam concentrate is unanimous.
2. The mixing device of claim 1, wherein a compressed air injection diffuser (210) is disposed in the mixing chamber of the housing (700), the compressed air injection diffuser (210) is provided with a branch hole for allowing compressed air to enter the mixing chamber, one end of the compressed air injection diffuser (210) is provided with a compressed air inlet (200), and the other end is arranged along the direction of introduction of compressed air.
3. The mixing device of claim 1 or 2, wherein the foam mixture introduced through the foam concentrate inlet (100) enters the mixing chamber along the axial direction of the housing (700), and the end of the compressed air injection diffuser pipe (210) away from the compressed air inlet (200) is also arranged along the axial direction of the housing (700).
4. A compressed air foam fluid mixing apparatus according to claim 1 or 2 wherein the mixing chamber is divided into more than two mixing chambers.
5. The compressed air foam fluid mixing device according to claim 4, wherein the compressed air injection diffuser (210) corresponds to more than two mixing chambers, and a branch hole is provided on the compressed air injection diffuser (210) in each mixing chamber.
6. A compressed air-foam fluid mixing apparatus according to claim 5 wherein the apertures and/or number of the splitter openings in each mixing chamber stage are the same or different and the amount of compressed air distributed to each mixing chamber is controlled by controlling the aperture and/or number of splitter openings in each stage.
7. The compressed air foam fluid mixing apparatus of claim 4 wherein a mixing chamber partition is provided between two adjacent mixing chambers, and when the compressed gas and the foam solution are mixed in one mixing chamber, the compressed gas will pass through the mixing chamber partition and enter the next mixing chamber.
8. The mixing device of claim 7, wherein the partition of the mixing chamber is a umbrella-type structure, the middle part of the partition is sleeved on the compressed air injection air dispersing pipe (210), the panel of the partition of the mixing chamber is provided with a plurality of holes (503), and the holes (503) are uniformly formed on the partition of the mixing chamber for the compressed air and the foam solution to mix and pass through.
9. A compressed air foam fluid mixing apparatus according to claim 8 wherein said holes (503) are elongated and open in the radial direction of the canopy.
10. A compressed air-foam fluid mixing apparatus according to claim 8 wherein the apertures and/or number of holes (503) in the partition of each mixing chamber are the same or different, and the apertures and/or number of holes (503) in each stage are controlled to allow the compressed air and foam solution to be mixed uniformly.
11. The mixing device of claim 5, wherein each of the diversion holes is provided with a compressed air diffuser ring at a position corresponding to a bell-mouth structure, the middle portion of the compressed air diffuser ring is sleeved on the compressed air injection pipe (210), and the diversion holes of the compressed air injection pipe (210) are located at the bell-mouth position of the compressed air diffuser ring (210).
12. The compressed air foam fluid mixing device as claimed in claim 2, wherein a foam dispersion baffle ring (300) is provided on said compressed air injection diffuser (210) at a position close to the compressed air inlet (200), and when foam liquid enters from the foam solution inlet (100), the foam liquid is dispersed and dispersed by the foam dispersion baffle ring (300) and mixed with the compressed air from the diversion hole to form foam in the mixing chamber.
13. The mixing device of claim 12, wherein the foam concentrate scattering baffle ring (300) is in a bell-mouthed configuration and is sleeved on the compressed air injection diffuser pipe (210), and the upper diversion holes of the compressed air injection diffuser pipe (210) are located at the bell-mouthed position of the foam concentrate scattering baffle ring (300).
14. A compressed air foam fluid mixing apparatus according to claim 1 or 2 wherein the compressed air inlet (200) is a length of stand-alone pipe or is integral with a compressed air injection diffuser pipe (210).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343789.XA CN110975193B (en) | 2019-12-24 | 2019-12-24 | Compressed air foam fluid mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343789.XA CN110975193B (en) | 2019-12-24 | 2019-12-24 | Compressed air foam fluid mixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110975193A true CN110975193A (en) | 2020-04-10 |
| CN110975193B CN110975193B (en) | 2024-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911343789.XA Active CN110975193B (en) | 2019-12-24 | 2019-12-24 | Compressed air foam fluid mixing device |
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| Country | Link |
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| CN (1) | CN110975193B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115350426A (en) * | 2022-08-31 | 2022-11-18 | 徐工消防安全装备有限公司 | Fire-fighting foam foaming device, system and foaming method |
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| CA2480397A1 (en) * | 2003-09-04 | 2005-03-04 | Sunbeam Products, Inc. | Fluid mixing device and dispensing system |
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| CN108635702A (en) * | 2018-05-16 | 2018-10-12 | 东华大学 | Foam solution mixing generating means in a kind of compressed air foam fire-extinguishing system |
| CN212700173U (en) * | 2019-12-24 | 2021-03-16 | 磐龙安全技术有限公司 | Compressed air foam fluid mixing device |
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2019
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| CN2460131Y (en) * | 2000-11-29 | 2001-11-21 | 北京市昌平县亚东金属结构厂 | Middle-low multiple foam generator |
| CA2480397A1 (en) * | 2003-09-04 | 2005-03-04 | Sunbeam Products, Inc. | Fluid mixing device and dispensing system |
| CN101754785A (en) * | 2007-04-27 | 2010-06-23 | Sogepi有限公司 | Improved compressed air foam technology |
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| CN115350426A (en) * | 2022-08-31 | 2022-11-18 | 徐工消防安全装备有限公司 | Fire-fighting foam foaming device, system and foaming method |
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| CN110975193B (en) | 2024-05-28 |
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