CN1359453A - Foam generator for fire extinguisher - Google Patents
Foam generator for fire extinguisher Download PDFInfo
- Publication number
- CN1359453A CN1359453A CN00809660A CN00809660A CN1359453A CN 1359453 A CN1359453 A CN 1359453A CN 00809660 A CN00809660 A CN 00809660A CN 00809660 A CN00809660 A CN 00809660A CN 1359453 A CN1359453 A CN 1359453A
- Authority
- CN
- China
- Prior art keywords
- mixing chamber
- nozzle
- housing
- foam
- fire extinguisher
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/463—Arrangements of nozzles with provisions for mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/311—Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
- B01F25/3111—Devices specially adapted for generating foam, e.g. air foam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The present invention pertains to the field of fire-fighting techniques and relates to a foam generator comprising a cylindrical body with flanges at the ends thereof, wherein one of said flanges comprises a nozzle for supplying an aqueous solution of a foaming agent. The side surface of the body also includes a radial duct for supplying air. The body includes a cylindrical mixing chamber that widens at the outlet as well as a conical diffuser. The mixing chamber is arranged so that its longitudinal axis is offset relative to the longitudinal axis of the nozzle. A load is attached to the mixing chamber so as to leave a gap relative to the body. In a first embodiment, the diffuser is connected by its lager base to the flange of the body which is opposite the nozzle. In a second embodiment, the mixing chamber is mounted inside the body using an additional support in the shape of a thin-wall truncated cone. It is thus possible to increase the pressure conversion ratio.
Description
Technical field
The invention belongs to the fire prevention field and relate to a kind of foam type fire extinguisher, described fire extinguisher can be used for storing the bottom spraying type suppression system of lightweight inflammable liquid storage tank, that is to say, can be applicable to through the tank bottom district directly carry the system of foam to the liquid level that is burning.
Major requirement to the foam type fire extinguisher that is applied to the bottom spraying type suppression system is, foam for the even rill shape structure that generates low range, should have very high pressure conversion coefficient, no matter this rill shape structure is when foam flows into air dielectric, during the lightweight of still flowing through inflammable liquid layer, can both guarantee that foam is stable for a long time.At this moment pressure conversion coefficient is the foam pressure of foam type fire extinguisher outlet end and the foaming agent water solution ratio at the pressure of foam type fire extinguisher entry end, and the foam multiplying power then is the foam volume that generates and the ratio of the volume of foaming agent solution.
When the pressure conversion coefficient was very high, can adopt sparger was the foam of the low range that generates of the foam type fire extinguisher on basis.
Background technique
Known a kind of air water sparger (description of the invention No.1642091, International Classification of Patents (the 5th edition): F04F 5/04, the day for announcing: on April 15th, 91), include the cylindric receiving chamber of being with the impact type nozzle and the housing that has the mixing chamber of being made by elastic material, mixing chamber is positioned at housing and forms a cavity.The entrance of mixing chamber is fixed in the housing, and outlet section then is unsettled.
During sparger work, liquid medium flows out from nozzle, simultaneously gas medium is joined in the mixing chamber, forms thick foam solution gas emulsion in mixing chamber.
This sparger can not be as the foam type fire extinguisher of bottom spraying type fire extinguishing.Because the foam that generates is thick pumiceous texture, does not have required stability, thereby can not pass lightweight inflammable liquid layer and arrive its surface.
Known a kind of pulsed sparger (description of the invention No.1618904, International Classification of Patents (the 4th edition): F04F 5/20, the day for announcing: on January 7th, 91) include the impact type nozzle, carry the connecting tube and the mixing chamber of Active Medium and dielectric passivation, mixing chamber forms the diffuser and the reducing pipe of the band nozzle of coaxial setting successively.The mixing chamber of sparger has the hydropneumatic liquid-storage container.
The shape of mixing chamber guarantees required eigentone, and when eigentone was the multiple of frequency of the Active Medium carried, jet coefficient increased, and will improve the energy of mixture at the sparger outlet end.
The hydropneumatic liquid-storage container guarantees the vibration processes in the mixing chamber, makes the foam granularity less, thereby can improve the stability from external agency pressure.
Implementing this technological scheme must be cost with additional energy and a large amount of equipment inputs that is used for the hydropneumatic liquid-storage container, therefore not too is applicable in the fire prevention field and uses.
Known a kind of foam type fire extinguisher (patent specification No.2058169, International Classification of Patents (sixth version): A62C 5/02, the day for announcing: on April 20th, 96) include the housing of flanged dish, the conveying connecting tube of the ring-type header pipe of band foaming agent solution shower nozzle and transporting compressed gas body, shower nozzle and header pipe are mounted to and can move back and forth with respect to housing, the also form that can fix, also include the foam pump below fire extinguisher, the compensation plug-in unit of shape that the foam pump has slotting box (2 to 4), inserting box is made of flexible connecting tube, these connecting tubes are connected in the public slot shape outlet of a truncated cone shape, and are fixed on the otch of fire extinguisher housing.
This fire extinguisher belongs to the spraying fire extinguisher, and air wherein sprays from surrounding space with the form of the stabilizer jet of atomisation.For generating foam, carry foaming agent water solution through carrying connecting tube to shower nozzle with pressure.The foaming agent water solution that is transported to shower nozzle is under pressure by also spraying in the air simultaneously.Air flows in one group of reticulated work with the thin solution pearl mixture that looses, and generates foam here.
This fire extinguisher can guarantee to generate more stable rill shape foam.But, therefore can not guarantee foam passed the lightweight inflammable liquid layer that may reach 18 meters and be sent to the surface of storage tank with it because foaming process is attended by the remarkable reduction of pressure.So being suitable in the bottom spraying type suppression system, this structure do not use.
As the most approaching documents of the present invention (the fixing top of bottom spraying type automatic fire extinguishing system in the reinforced concrete tank and steel with floating roof tank in the design recommendation book of bottom spraying type automatic fire extinguishing system, 1996, the 20th page, Fig. 7; The 23rd page, technological scheme Figure 10) has disclosed a kind of high-pressure extinction device, it includes housing and is installed in the nozzle that is used to carry foaming agent in the housing, include the connecting tube that is used for conveying gas with air valve, be rigidly fixed in the housing in addition and constitute the toroidal sprayer of gas-liquid mixture outlet, the airflow guiding device that also comprises the hollow truncated cone shape fixing from the inboard, this hollow truncated cone and sprayer constitute the slot that dwindles to the center from the surface.
If sprayer is formed near the long trumpet shape of carrying the foaming agent aqueous solution nozzle, can guarantees the generation of low range foam.But, being rigidly fixed in the foam that the interior sprayer of housing can only generate big balloon-shaped structure, the foam of this big balloon-shaped structure does not have the required enough stability of bottom spraying type suppression system.In view of this, the foam type fire extinguisher of this structure can not be realized required fire extinguishing effect.
Invention description
The objective of the invention is to propose a kind of foam type fire extinguisher that generates the very high pressure conversion coefficient of having of low range foam, this low range foam has uniform rill shape structure, when foam passed inflammable liquid, it had very high stability to the pressure from the lightweight inflammable liquid.
Use foam type fire extinguisher of the present invention and can realize above-mentioned purpose.
Identical with the technological scheme of immediate documents, foam type fire extinguisher of the present invention comprises that end face has the cylindrical shell of flange plate, the nozzle of carrying foaming agent water solution is installed in a flange plate, the radially connecting tube of carrying air is installed on the side of housing, also comprise being installed in cylindrical mixing chamber and the spray cone device that is positioned at the nozzle opposite in the housing, the entry end of mixing chamber is a broadening.
Different with immediate documents is, in foam type fire extinguisher of the present invention, the longitudinal axis of the longitudinal axis nozzle of mixing chamber, on mixing chamber, be fixed with a weight hammer, this weight hammer leaves certain clearance with housing, this weight hammer impels exciting of sprayer self-vibration, and guarantees to give foam flow with these vibration transfer.
According to first scheme of the present invention, the bigger bottom of sprayer is fixed on the flange plate relative with nozzle.
According to alternative plan of the present invention, with additional supporting member mixing chamber is fixed in the housing, this supporting member is the thin-walled truncated cone shape, the big end of circular cone is fixed on the flange plate on nozzle opposite.
Foam type fire extinguisher of the present invention has kept the advantage of technological scheme in the immediate documents, promptly be positioned at the nozzle opposite and become cylindrical owing to mixing chamber, has the radially connecting tube of carrying air in the side of housing, thereby the best that will guarantee foaming agent water solution flows into state, and the air that can also guarantee maximum quantity is transported to mixing chamber, thereby guarantees to be full of air and to generate the proportion low range foam littler than the proportion of lightweight inflammable liquid in the aqueous solution.
In addition, the additional advantage that also has of foam type fire extinguisher of the present invention is:
Because mixing chamber and sprayer are fixed on the flange plate on nozzle opposite with respect to the big bottom of nozzle disalignment and sprayer, thereby the exciting of transverse vibration that will impel mixing chamber and sprayer, the spoke that shakes of transverse vibration is limited by the housing of foam type fire extinguisher.
Weight hammer with predetermined weight is fixed on the mixing chamber, and leaves certain interval with housing, and this weight hammer will guarantee the required natural frequency of vibration.The stable system's self-vibration that is produced impels and form unique " boiling bed " on the periphery of mixing chamber start-up portion, and this " boiling bed " impels the aqueous solution of stabilizer effectively to mix and make the bubble miniaturization of foam with air.The mixing chamber that is produced and the dither of sprayer will impel bubble further to be divided, thereby will improve the stability of foam widely.
The supporting member of employing that proposes in second embodiment of foam type fire extinguisher can guarantee not only that to the fixing method of mixing chamber mixing chamber has the vibration of an end of weight hammer, but also can guarantee to have the vibration of the other end of sprayer.The vibration that acts on the foam flow in the whole mixing chamber will impel the uniform rill shape foaming structure of generation.
Mixing chamber is preferably in entry end and has a cylindric plug-in unit, and this plug-in unit is rigidly fixed on the interior supporting member of mixing chamber, with the certain clearance of this supporting member maintenance with the face of survey.
The mixing chamber structure that has cylindric plug-in unit utilizes air further to be full of foaming agent water solution stream and the multiplying power of raising foam, thereby improves the working efficiency of foam type fire extinguisher.
The weight hammer is for discoid, on circumference, have one recessed, utilization impels weight hammer to slide along bus in the foam type fire extinguisher housing with respect to the centre-of gravity shift of the public geometrical axis of vibration system, and this has guaranteed the exciting of revolution self-vibration of the wide spectrum that periodically repeats simultaneously again.Therefore can improve the uniformity of the foam that is generated.
Description of drawings
Also the present invention is described further in conjunction with the accompanying drawings with comparative examples below.Shown in the figure:
Fig. 1 is the structural representation of foam type fire extinguisher first scheme of the present invention;
Fig. 2 is the foam type fire extinguisher sectional view along Figure 1A-A line; With
Fig. 3 is the structure of foam type fire extinguisher alternative plan and the concrete structure schematic representation of mixing chamber.
Embodiment
Foam type fire extinguisher shown in Figure 1 comprises cylindrical housings 1, has the flange plate 2,3 that is positioned at both ends of the surface on the housing; Nozzle 4 is installed on the flange plate 2, and connecting tube 5 is installed on the side of housing 1, air valve 6 is installed on connecting tube 5; In the cavity of housing 1, be provided with rigidly connected mutually (for example welding) mixing chamber 7 and sprayer 8, make being connected of mixing chamber 7 and sprayer 8 it connect longitudinal axis with respect to 2 to 3 millimeters of the longitudinal axis of nozzle 4.The bigger bottom fixed installation (for example welding) of sprayer 8 is on flange plate 3.
Be fixed with the weight hammer 9 of a round metal plate-like on mixing chamber 7, metal dish encircles mixing chamber 7 and encloses, and also has a recess 10 on metal dish; According to the weight of the selected weight hammer 9 of the required natural frequency of vibration of system, this system is: weight hammer-mixing chamber-sprayer.
Fig. 3 illustrates the alternative plan of foam type fire extinguisher, and the difference of this scheme and first scheme is that it comprises the supporting member 11 of a thin-walled frustum-like shape, and the less end of circular cone is fixed on the weight hammer 9, and its bigger end is fixed on the flange plate 3 of shell 1.
The working method of this foam type fire extinguisher is as follows.
When on fire in storage tank and the starting of bottom spraying type suppression system, flow out through nozzle 4 from the pump of working pressure 8 to 10 MPas or the foaming agent water solution of fire-protection equipment output, through the valve of opening 6 ambient air is sucked in the mixing chamber 7 simultaneously, the air of high turbulent flow in mixing chamber-liquid medium interacts, flow into sprayer 8 then, sprayer 8 plays a part explosion chamber, thereby makes fire extinguisher recover pressure at outlet end.
Different with nozzle 4 longitudinal axis axles are gone up and the centre-of gravity shift of weight hammer 9 because mixing chamber 7 is arranged on, thereby will make the turbulent flow of air-liquid mixture enter mixing chamber to cause radially rotary vibration when interior.9 these vibrations will be reinforced based on the weight hammer, so system will enter stable self-oscillating regime.This stable self-vibration of system will form unique " boiling bed ", should " boiling bed " will impel air bubble effectively to mix and miniaturization, therefore can improve the stability of foam widely.
Our experiments show that the foam type fire extinguisher that is proposed can generate and be not less than 3 to 3.4 low range foams.Foam has uniform rill shape structure, and the diameter of each foam is less than 1 millimeter.No matter be when foam enters air dielectric, still when foam passed the lightweight inflammable liquid that has pressure own, this rill shape structure can both guarantee that foam has enough stability.
Simultaneously, this foam type fire extinguisher has very high pressure conversion coefficient (being not less than 30%), for example, when the pressure of entry end is 9 barometric pressure, about 3 barometric pressure of the pressure of foam type fire extinguisher outlet end.Foam is transported to the bottom zone of storage tank under 3 barometric pressure effects, the pressure that overcomes lightweight inflammable liquid (the liquid column height can reach 18 meters) in the storage tank arrives reservoir surface, and distributes along the liquid surface that is burning, thereby realizes fire extinguishing.
Foam type fire extinguisher proposed by the invention is highly suitable for using in the bottom spraying type suppression system of the storage tank that stores easy firing liquid.
Claims (4)
1. foam type fire extinguisher, comprise that end face is provided with the cylindrical housings of flange plate, the nozzle that is used to carry foaming agent water solution is installed on one of them flange plate, the radially connecting tube that is used for conveying gas is installed on the side of housing, also comprise and be installed in the cylindrical mixing chamber relative in the housing with nozzle, mixing chamber has the entry end of expansion, and the spray cone device that also is included in the mixing chamber outlet end, it is characterized in that:
The mixing chamber longitudinal axis position deviation nozzle longitudinal axis, the big bottom of sprayer is fixed on the flange plate on nozzle opposite, is fixed with a weight that forms a gap with housing simultaneously and hammers into shape on mixing chamber, to impel exciting of self-vibration.
2. foam type fire extinguisher, comprise that end face is provided with the cylindrical housings of flange plate, the nozzle that is used to carry foaming agent water solution is installed on one of them flange plate, the radially connecting tube that is used for conveying gas is installed on the side of housing, also comprise and be installed in the cylindrical mixing chamber relative in the housing with nozzle, mixing chamber has the entry end of expansion, and the spray cone device that also is included in the mixing chamber outlet end, it is characterized in that:
The longitudinal axis of the longitudinal axis position deflection nozzle of mixing chamber, the supporting member of the thin-walled truncated cone shape that the mixing chamber utilization is additional is fixed in the housing, truncated cone encircles the part of mixing chamber and encloses and bottom that it is bigger is fixed on the flange plate on nozzle opposite, simultaneously in the supporting member front and be fixed with a weight that forms a gap with housing hammer into shape to impel exciting of self-vibration on mixing chamber.
3. according to claim 1 or 2 each described foam type fire extinguishers, it is characterized in that mixing chamber has an inlet cylindrical inserts, plug-in unit has the conical entrance end and utilizes supporting member to be rigidly fixed on the mixing chamber inner side surface with certain clearance.
4. according to claim 1 or 2 each described foam type fire extinguishers, it is characterized in that the weight hammer has been provided with recess for discoid on the cylindrical of disk.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU99113724A RU2145680C1 (en) | 1999-06-28 | 1999-06-28 | Foam generator (versions) |
| RU99113724 | 1999-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1359453A true CN1359453A (en) | 2002-07-17 |
Family
ID=20221802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00809660A Pending CN1359453A (en) | 1999-06-28 | 2000-06-23 | Foam generator for fire extinguisher |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN1359453A (en) |
| EA (1) | EA200200186A1 (en) |
| RU (1) | RU2145680C1 (en) |
| UA (1) | UA46178C2 (en) |
| WO (1) | WO2001000997A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028333A (en) * | 2012-12-04 | 2013-04-10 | 北京中卓时代消防装备科技有限公司 | High-efficient foaming device for compressed air A-type foams |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU747419B2 (en) | 1997-11-05 | 2002-05-16 | Neurosearch A/S | Azaring-ether derivatives and their use as nicotinic ACH receptor modulators |
| RU2451559C1 (en) * | 2011-02-03 | 2012-05-27 | Олег Савельевич Кочетов | Vortical foam generator of ejection type |
| RU2451560C1 (en) * | 2011-02-03 | 2012-05-27 | Олег Савельевич Кочетов | Foam generator of ejection type with vortical sprayer |
| RU2457895C1 (en) * | 2011-04-15 | 2012-08-10 | Олег Савельевич Кочетов | Fine mixe production plant |
| RU171877U1 (en) * | 2016-10-11 | 2017-06-20 | Общество с ограниченной ответственностью "Пожнефтехим" | FOAM GENERATOR |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3797747A (en) * | 1971-09-25 | 1974-03-19 | Hano Grohe Kg Fa | Device for aspirating and admixing additives into a stream |
| US4041981A (en) * | 1976-04-28 | 1977-08-16 | Fischer & Porter Co. | Ejector assembly |
| SU623999A1 (en) * | 1977-01-04 | 1978-09-15 | Казанский ордена Трудового Красного Знамени авиационный институт им. А.Н.Туполева | Water-jet vortex ejector |
| US4330086A (en) * | 1980-04-30 | 1982-05-18 | Duraclean International | Nozzle and method for generating foam |
| DE3125583A1 (en) * | 1981-06-30 | 1983-01-13 | Bälz, Helmut, 7100 Heilbronn | JET PUMP, ESPECIALLY FOR HOT WATER HEATING OR PREPARATION PLANTS WITH RETURN ADMINISTRATION |
-
1999
- 1999-06-28 RU RU99113724A patent/RU2145680C1/en active
-
2000
- 2000-06-23 EA EA200200186A patent/EA200200186A1/en unknown
- 2000-06-23 WO PCT/RU2000/000247 patent/WO2001000997A1/en active Application Filing
- 2000-06-23 UA UA2001129210A patent/UA46178C2/en unknown
- 2000-06-23 CN CN00809660A patent/CN1359453A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028333A (en) * | 2012-12-04 | 2013-04-10 | 北京中卓时代消防装备科技有限公司 | High-efficient foaming device for compressed air A-type foams |
| CN103028333B (en) * | 2012-12-04 | 2014-10-15 | 北京中卓时代消防装备科技有限公司 | Foaming device for compressed air A-type foams |
Also Published As
| Publication number | Publication date |
|---|---|
| UA46178C2 (en) | 2002-05-15 |
| RU2145680C1 (en) | 2000-02-20 |
| EA200200186A1 (en) | 2002-06-27 |
| WO2001000997A1 (en) | 2001-01-04 |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |